A radial lip seal made of nitrile to get rid of those nasty rear main oil leaks. This seal is made for the 1932-34 4-cylinder motor and can be used 2 different ways. The kit contains two nitrile rings. When using this seal with the original B-6335 seal, you will use half of one ring and half of the other ring. If you use the B-6335-X rear main seal, you will be able to use one of the nitrile rings in one piece without having to cut them. Instructions can be downloaded from the web site so you can see what is involved. U.S.A.