Mr. Gasket Differential Gasket Features: Precision Cut High-Quality Materials Reusable Height: 12.90 Width: 11.40 Length: 0.30 Weight: 0.31 lbs Fitment: 1981/Pontiac/Firebird/Trans Am Coupe 2-Door/5.0L 305Cu. In. V8 GAS OHV Naturally Aspirated::Rear, Rear 8.5 in. (10 Bolt)^^1981/Pontiac/Firebird/Trans Am Coupe 2-Door/4.9L 301Cu. In. V8 GAS OHV Turbocharged::Rear, Rear 8.5 in. (10 Bolt)^^1981/Pontiac/Firebird/Trans Am Coupe 2-Door/4.9L 301Cu. In. V8 GAS OHV Naturally Aspirated::Rear, Rear 8.5 in. (10 Bolt)^^1981/Pontiac/Firebird/Trans Am Coupe 2-Door/4.4L 267Cu. In. V8 GAS Naturally Aspirated::Rear, Rear 8.5 in. (10 Bolt)^^1981/Pontiac/Firebird/Formula Coupe 2-Door/5.0L 305Cu. In. V8 GAS OHV Naturally Aspirated::Rear, Rear 8.5 in. (10 Bolt)^^1981/Pontiac/Firebird/Formula Coupe 2-Door/4.9L 301Cu. In. V8 GAS OHV Turbocharged::Rear, Rear 8.5 in...