MSD odd-fire distributors needed , needs to be the later style ball bearing housing with bolt down cap. actually need the reluctor out of it !! so if you happen to have an odd-fire reluctor that will work also. I built my distributor using one of these and now want to build a couple of spares. Let me know what you got !! buickv6@hotmail.com cell 937-272-4313 Ohio thanks Mike