The Llr-F900 Differential Cover Gasket From Lubelocker Is Compatible with Your Competition Ford 9 Inch. All Lubelocker Gaskets Are Engineered Using An Elastomer Coated Metal Base Along With A Full Perimeter Sealing Bead. The Elastomer Beading Give You A Dry Seal That PerformsUnder The Pressures Of Temperature And Flexing Of The Axle. These Differential Cover Gaskets Are Trusted Where You Need Them Most Whether You're On The Track, Road, Dirt Or Sand You Can Depend On The Lubelocker Gasket.