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.
Master Kit: 85-93 Mustang
Control Arm Bushing Set: 66 A bodies (set 8) - Front End
80-96 Bronco Body Mount Kit
95-98 Nissan 240ZX Master Kit
Rear Strut Rod Bushing: 84-87 Set: 84-87 Corvette
1973-80 Chevy Truck Cab mount Kit
64-66 Front Strut Rod Bushing set
Sway Bar Rear Bush kit (8) various Jap 88-92
Engine Mount: Small Block CHEV V8 - Tall & Narrow
64-66 Front Lower Control Arm Bush Set