I looked at the housings and the 3738365 has two holes in the pad where the bellhousing sits on the crossmember and all four holes for the trans are taped. someone said this was for a v8 in a pass car not truck. the 8815891 has a single hole where the cover sits on the crossmember and the lower trans mount holes are passthru. . that's the one I plan to use. hope to get the engine tomorrow and check the casting # to see what I got.
