Racer Performance 1978-UP Chevy/GM Chrome Steel Rear Differential Cover - 10 Bolt w/ 7.5"/7.625" Ring Gear Chevy/GM chrome steel rear differential cover with 10 bolt pattern. Fits 10 bolt Chevy/GM car and truck rear ends with 7-1/2" & 7-5/8" ring gear. See product description for compatible makes and models.