7.5 GM cover gasket.

12 Bolt Rear End Cover Gasket fits Chevy Pontiac Oldsmobile GM Differential

Rear End Differential Cover Gasket Fits Ford 7.5" R.G. Bolts Gray Fiber

Rear End Differential Cover Gasket Fits GM Truck 12 Bolt Gray Fiber

Rear End Differential Cover Gasket Fits GM Truck 14 Bolt Gray Fiber

Motive Gear Differential Cover Gasket, Compressed Fiber, GM 7.5 in, Each Stock

Gray Fiber Differential Cover Gasket For GM Cars with 7.5 In Ring Gear 10 Bolts

10 Bolt Rear End Cover Gasket fits Chevy Pontiac Oldsmobile and GMC Differential