This is a welcome new part for the 3rd & 4th series Firebird & Camaro owners/ repairers.
On the outer frame as shown below lives the diff bump stops.. This will replace both for the price of less then one GM unit.
Body Mount Kit: 73-82 Corvette
Bump stop: single pin mount
Front Control Arm Bushing Kits: 70-81F
Rear Strut Rod Bushing set: 88-96 Corvette
Body Mount Kit: 78-88 El Camino
Control Arm Bushing Set: 75-77 models - FRONT End
Bump Stop Universal (red or Black) - Pair
Rear Sway Bar bushing set complete: 2011-14 Camaro
90-95 4 Runner Master Kit
Tie Rod End Dust Boots (2)