Good luck. Most of these leak regardless of what type of seal you use. I've used the rubber replacements on 4 engines so far, and they all leaked to some degree. They were all 56-62 type engines. Not sure if they make a rubber type for the 54-earlier or not. I haven't checked.
There was a article in the 12 Port News a few months back about using a one piece seal. Would require grinding a couple of "flats" on the crank flange to allow the seal to pass over the crank flange.
