Here is a vintage dated June 1975 4-112 / Weatherly Index 148 KELSEY-HAYES "121" COMPUTER BRAKE CONTROL CATALOG : Includes Application For FMVSS 121 Air Braked Truck / Tractors and Trailors. no rips tears or defacing to pages. ring binder hole area at left side has some curling to catalog. please view all pics. I ship within 24hrs of cleared payment.