Spectre's Differential Covers are made to OEM specifications and are triple chrome plated for a lasting shine. Designed to protect the intricate moving parts of the differential, Spectre's covers add an extra layer of protection to the vehicle's underside. Featuring a 10-bolt design and including a gasket, this differential cover is designed to fit 1977-1991 Chevy/GMC Pickup/Suburban 1/2-3/4 ton four-wheel drive front differentials. Includes 10 SAE standard chrome bolts for installation. You'll need to supply your own bolts if your application requires metric bolts. Spectre s Differential Covers are made to OEM specifications and are triple chrome plated for a lasting shine. Spectre s covers add an extra layer of protection to the vehicle s underside.