I ordered a couple from Steiner in that link. I thought that was the only one they sell for the Delco and that I would file it down to fit the .310 hole in mine. As soon as I ordered it showed me another option which is the exact part for the 54 with the keyway on the shaft. I am trying to have the order changed at the moment. For interest, the more correct part is #ABC500 Square Shoulder type.
