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.
Honda Civic & CRX Master Kit: 84-87
Master Kit: 2001-06 GMC / Silverad Various
Control Arm Bump stops: LOWER 64-72 GM (PR)
Body Mount Kit: 55-57 Chev Convertible
Track Rod Bushings; Ford F350 92-97 era
Control Arm Bushing Set: LOWER Fits 90-96 300ZX
1959-75 Jeep CJ5 Black Front or Rear Leaf Spring Bushing Kit
55-57 Chev Belair/ 210 Motor Mount Insert Set
82-92 Firebird & Camaro Master Kit.