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.