You are bidding on 2 used O.S. #905 aluminum engine mounts. In addition to the 4 pre-drilled holes, the previous owner drilled another 4 holes. I have no idea what engine they were drilled to fit. In spite of the 4 extra holes, the mounts appear perfectly usable. A bit ugly, but useable. I have 2 - O.S. 70 Surpass's II currently on eBay.