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.
62-72 A body Upper control Arm Bushes (4)
Rear End Control Arm Bushing Set 89-95 Crx /Civic
Master Kit: Chrysler/Plymouth 66-76 A Body various
PT Cruiser Lower front Ball Joint
Disc Brake Kit: Complete 67-9 Camaro & Firebird - Stock Height
Body Mount Kit: 59-64 Impala/Parisienne/ Laurentian/ Belair
Rear Leaf Bushing Kit: 67-81 W/ Front Bushes
Master Kit: 67-72 "A Body\" Coupe & Convertible"
A Disc Kit: 74-78 Mustang II Stock Height High Perf Kit
Sway Bar Link Kits: 83-04 Mustang Pr