rear main seal leak

The rear main should be the same for both. There's an early "rope" type, which is what I use because it never leaks, and there's a later lip type that can sometimes leak after a while. There are a couple minor differences but those are basically it. Are you certain the leak is the rar main? You also have a cam plug and several oil galley plugs in the bell area that will run down onto the bellhousing and drip.