Used on a 2000 F350 DRW with a Dana 80 rear. I started with a gasket from Napa that was flanged and had a molded "bead" of sealant around the gasket. It seemed like a good idea, except it was so tight that any attempt to install it resulted in the flange just collapsing and eventually falling apart. I pulled it out and ordered this seal. This Timken seal had no flange or gasket on the outside. Instead it had an O-ring around the back that seals the step into the body when lowered during installation. This gasket fits perfectly. It was snug enough but not too tight, slipped on easily and you knew when it was there. You can not ask for more. After a few hundred kilometers there is no sign of a liquid leak.