I bought a diff cover off another forum and the seller was throwing in one of these as a gimme... I must say, it is pretty sweet. I had to mess with my ARB a few times and as a result had to drain the diff 3 times over the course of a week. With this gasket, it was soooo nice not having to wait for curing or whether or not it made a complete seal... Granted, i'd never pay that kind of coin for a gasket :)