This listing if for 1 brand new cast Iron Steel Dual Pattern Flywheel, This Flywheel is a Ford factory style replacement when using the early Long-style 10" clutch or the 10" Diaphragm style clutch used on some 1964-1979 Mustangs and other Ford models like Fairlane, F-100, Falcon, Comet, Maverick, Grand Torino, Cougar and others with the 3 speed, 4 speed, T-5 5 speed  manual transmissions.
This unique Dual Pattern Flywheel gives you the option to upgrade your clutch kit to a 10.5" Diaphragm clutch set up used on Hi-Po 1979-2001 Mustangs when doing the T-5 conversion on your Classic 1964-1973 Mustang without having to replace the Flywheel and is used on small block Ford 260/ 289/ 302/ 357W/ 351C, 4.7L,5.0L

157 Tooth ring gear
28 Oz. External balance
13.25" O.D
6 Bolt crank mount
Metric dowel pins
Weight 19.66 LBS.
8mm threads for 10.5" clutch
5/16" threads for 10" clutch