Genuine Toro 106-3987 Blade Adapter & Spacer Driver 106-3999 Lawn Boy

If you're replacing this part, make sure you have spacer!

This is the adapter that goes from engine to the blade and has pulley for the front wheel drive.

Superseded part numbers 104-8695, 104-8687 Recyclers 2002 & Newer

This adapter has been used since 2002 and it still the current adapter. Used in 201 different models.

If getting vibration from your mower this could be part of the reason.

This part is used in 201 models.

Model: 10604 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10606 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10607 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10624 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10627 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10634 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10640 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10640C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10641 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10641C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10642 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10642C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10643C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10644C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10645 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10646 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10647 (20in Mulching/Rear Bagging Lawn Mower)

Model: 10649C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10650C (20in Mulching/Rear Bagging Lawn Mower)

Model: 10654 (Gold Series Lawnmower)

Model: 10655 (Gold Series Lawnmower)

Model: 10656 (Gold Series Lawnmower)

Model: 10662 (Insight Lawn Mower)

Model: 10665 (Insight Lawn Mower)

Model: 10665C (Insight Lawn Mower)

Model: 10666 (Insight Lawn Mower)

Model: 10666C (Insight Lawn Mower)

Model: 10670C (Insight Lawn Mower)

Model: 10671 (Insight Lawn Mower)

Model: 10672 (Insight Gold Lawn Mower)

Model: 10673 (Insight Gold Lawn Mower)

Model: 10682 (Insight Lawn Mower)

Model: 10683 (Insight Lawn Mower)

Model: 10684 (Insight Lawn Mower)

Model: 10684C (Insight Lawn Mower)

Model: 10685 (Insight Lawn Mower)

Model: 10686 (Insight Lawn Mower)

Model: 10686C (Insight Lawn Mower)

Model: 10694 (Insight Gold Lawn Mower)

Model: 10695 (Insight Gold Lawn Mower)

Model: 10696 (Insight Gold Lawn Mower)

Model: 10696C (Insight Gold Lawn Mower)

Model: 10732 (21in Mulching/Rear Bagging Lawn Mower)

Model: 10734 (21in Mulching/Rear Bagging Lawn Mower)

Model: 10738 (21in Mulching/Rear Bagging Lawn Mower)

Model: 10765 (Insight Platinum Lawn Mower)

Model: 10780 (Insight Platinum Lawn Mower)

Model: 10785 (Insight Platinum Lawn Mower)

Model: 10795 (Insight Platinum Lawn Mower)

Model: 10796 (Insight Platinum Lawn Mower)

Model: 10995 (Insight Gold Lawn Mower)

Model: 10996 (Insight Lawn Mower)

Model: 10997 (Insight Gold Lawn Mower)

Model: 10998 (Insight Lawn Mower)

Model: 17732 (21in Mulching/Rear Bagging Lawn Mower)

Model: 17734 (21in Mulching/Rear Bagging Lawn Mower)

Model: 20001 (22in Recycler Lawnmower)

Model: 20003 (22in Recycler Lawnmower)

Model: 20005 (22in Recycler Lawnmower)

Model: 20007 (22in Recycler Lawnmower)

Model: 20008 (22" Recycler Lawnmower)

Model: 20009 (22in Recycler Lawnmower)

Model: 20012 (22" Recycler Lawnmower)

Model: 20013 (22in Recycler Lawnmower)

Model: 20014 (22" Recycler Lawnmower)

Model: 20016 (22" Recycler Lawnmower)

Model: 20017 (22in Recycler Lawnmower)

Model: 20018 (22" Recycler Lawnmower)

Model: 20019 (22" Recycler Lawnmower)

Model: 20031 (22in Recycler Lawnmower)

Model: 20036 (Super Recycler Mower)

Model: 20037 (Super Recycler Mower with Bag)

Model: 20038 (Super Recycler Mower with Bag)

Model: 20039 (Super Recycler Mower with Bag)

Model: 20041 (22in Recycler Lawnmower)

Model: 20049 (22in Recycler Lawnmower)

Model: 20051 (22in Recycler Lawnmower)

Model: 20053 (Super Recycler Lawn Mower)

Model: 20054 (Super Recycler Lawn Mower)

Model: 20055 (Super Recycler Lawn Mower)

Model: 20057 (Super Recycler Lawn Mower)

Model: 20062 (Super Recycler Lawn Mower)

Model: 20064 (22in Recycler Lawn Mower)

Model: 20065 (22in Recycler Lawn Mower)

Model: 20066 (22in Recycler Lawn Mower)

Model: 20067 (22in Recycler Lawn Mower)

Model: 20069 (22in Recycler Lawn Mower)

Model: 20070 (22in Recycler Lawnmower)

Model: 20071 (22in Recycler Lawn Mower)

Model: 20071A (22in Recycler Lawn Mower)

Model: 20072 (22in Recycler Lawn Mower)

Model: 20072A (22in Recycler Lawn Mower)

Model: 20073 (22in Recycler Lawn Mower)

Model: 20073A (22in Recycler Lawn Mower)

Model: 20074 (22in Recycler Lawn Mower)

Model: 20074A (22in Recycler Lawn Mower)

Model: 20079 (22in Recycler Lawn Mower)

Model: 20086 (22in Recycler Lawn Mower)

Model: 20087 (22in Recycler Lawn Mower)

Model: 20089 (22in Recycler Lawn Mower)

Model: 20090 (Super Recycler Lawn Mower)

Model: 20090C (Super Recycler Lawn Mower)

Model: 20091 (Super Recycler Lawn Mower)

Model: 20091C (Super Recycler Lawn Mower)

Model: 20092 (Super Recycler Lawn Mower)

Model: 20092C (Super Recycler Lawn Mower)

Model: 20094 (22in Recycler Lawn Mower)

Model: 20095 (Super Recycler Lawn Mower)

Model: 20095C (Super Recycler Lawn Mower)

Model: 20096 (22in Recycler Lawn Mower)

Model: 20098 (22in Recycler Lawn Mower)

Model: 20099 (Super Recycler Lawn Mower)

Model: 20110 (22in Recycler Lawn Mower)

Model: 20111 (22in Recycler Lawn Mower)

Model: 20112 (22in Recycler Lawn Mower)

Model: 20113 (22in Recycler Lawn Mower)

Model: 20314 (20in Recycling/Rear Bagging Lawn Mower)

Model: 20316 (20in Recycler/Rear Bagging Lawn Mower)

Model: 20330 (22in Recycler Lawn Mower)

Model: 20330C (22in Recycler Lawn Mower)

Model: 20331 (22in Recycler Lawn Mower)

Model: 20331C (22in Recycler Lawn Mower)

Model: 20332 (22in Recycler Lawn Mower)

Model: 20332C (22in Recycler Lawn Mower)

Model: 20334 (22in Recycler Lawn Mower)

Model: 20334C (22in Recycler Lawn Mower)

Model: 20338 (22in Recycler Lawn Mower)

Model: 20339 (22in Recycler Lawn Mower with SmartStow)

Model: 20339C (22in Recycler Lawn Mower with SmartStow)

Model: 20340 (22in Recycler Lawn Mower with SmartStow)

Model: 20350 (22in Recycler Lawn Mower)

Model: 20351 (22in Recycler Lawn Mower)

Model: 20352 (22in Recycler Lawn Mower)

Model: 20370 (22in Recycler Lawn Mower)

Model: 20371 (22in Recycler Lawn Mower)

Model: 20372 (22in Recycler Lawn Mower)

Model: 20374 (22in Recycler Lawn Mower)

Model: 20377 (22in Recycler Lawn Mower)

Model: 20378 (22in Recycler Lawn Mower)

Model: 20380 (Super Recycler Lawn Mower)

Model: 20381 (Super Recycler Lawn Mower)

Model: 20384 (Super Recycler Lawn Mower)

Model: 20636 (Multicycler 48cm Lawn Mower)

Model: 20637 (Multicycler 48cm Lawn Mower)

Model: 20638 (Multicycler 48cm Lawn Mower)

Model: 20655 (55cm Recycler Lawn Mower)

Model: 20656 (55cm Recycler Lawnmower)

Model: 20781 (53cm Super Recycler Lawnmower)

Model: 20783 (53cm Super Recycler Lawnmower)

Model: 20784 (53cm Super Recycler Lawnmower)

Model: 20792 (53cm Super Recycler Lawn Mower)

Model: 20794 (53cm Super Recycler Lawn Mower)

Model: 20796 (53cm Super Recycler Lawnmower)

Model: 20797 (53cm Super Recycler Lawn Mower)

Model: 20835 (48cm Super Bagger Lawn Mower)

Model: 20836 (48cm Super Recycler Lawn Mower)

Model: 20838 (48cm Super Bagger Lawn Mower)

Model: 20950 (Recycler 48cm Lawn Mower)

Model: 20951 (Recycler 48cm Lawn Mower)

Model: 20952 (Recycler 48cm Lawn Mower)

Model: 20954 (55cm Recycler Lawn Mower)

Model: 20955 (55cm Recycler Lawn Mower)

Model: 20956 (55cm Recycler Lawn Mower)

Model: 20959 (55cm Recycler SmartStow Lawn Mower)

Model: 20961 (55cm Recycler Lawn Mower with SmartStow)

Model: 20995 (53cm Recycler Lawn Mower)

Model: 20996 (53cm Recycler Lawn Mower)

Model: 21381 (Super Recycler Lawn Mower)

Model: 21385 (Super Recycler Lawn Mower)

Model: 21386 (Super Recycler Lawn Mower)

Model: 21387 (Super Recycler Lawn Mower)

Model: 21681 (48cm Super Recycler)

Model: 21690 (53cm Super Recycler Lawn Mower)

Model: 21691 (53cm Super Recycler Lawn Mower)

Model: 21750 (53cm Mulching/Rear Bagging/Side Discharging Lawn Mower)

Model: 21751 (53cm Mulching/Rear Bagging/Side Discharging Lawn Mower)

Model: 21761 (55cm Recycler SmartStow Lawn Mower)

Model: 21762 (55cm Recycler Lawn Mower)

Model: 21763 (55cm Recycler Lawn Mower)

Model: 22163 (PT21 Trim Mower)

Model: 22164 (PT21 Trim Mower)

Model: 22164TE (HD53 Lawn Mower)

Model: 22193 (PT21 Trim Mower)

Model: 22194 (PT21 Trim Mower)

Model: 22290 (21in Heavy-Duty Recycler/Rear Bagger Lawn Mower)

Model: 22291 (53cm Heavy-Duty Recycler/Rear Bagger Lawn Mower)

Model: 29639 (50cm Mulching/Rear Bagging Lawn Mower)

Model: 29641 (50cm Mulching/Rear Bagging/Side Discharge Lawn Mower)

Model: 29642 (50cm Mulching/Rear Bagging Lawn Mower)

Model: 29643 (50cm Mulching/Side Discharge/Rear Bagging Lawn Mower)

Model: 29732 (53cm Mulching/Rear Bagging/Side Discharging Lawn Mower)

Model: 29734 (53cm Mulching/Rear Bagging/Side Discharging Lawn Mower)

Model: CODE446E (R48 Recycling Mower)

Model: CODE446F (R48 Recycling Mower)

Model: CODE447E (R48 Recycling Mower)

Model: CODE447F (R48 Recycling Mower)

Model: CODE447T (R48 Recycling Mower)

Model: CODE448E (R53S Recycling Mower)

Model: CODE448F (R53S Recycling Mower)

Model: CODE449E (R53A Recycling Mower)

Model: CODE449F (R53A Recycling Mower)

We at Red Rock Turf are distributors for Briggs and Stratton, Kohler, Toro dealer. We not only sell their OEM parts we also use them on our equipment repairs and rebuilds. If there is something you need and don't see it on one of our auctions, please email me through eBay and I can get it and create an auction for that item.