Marty (delux54panel) sent me the photos below to post here. This oil filter mounts on a 216/235 (to 1953) block, in place of a triangular cover on the manifold side of the block (the oil distributor).

216 oil filter "surface-mounted" oil filter #1

216 oil filter "surface-mounted" oil filter #2

216 oil filter "surface-mounted" oil filter #3

If anyone has a photo of the triangular oil-distributor cover on the side of the of the block, and/or a photo of the cover removed from the block, would you please post the photos (or, mail them to me and I will post them)?

Tim