More interference. There is a peg onthe pilot side of the mount that interferes with the back plate going down into the mounts. It is really hard to get to, finally found the air powered hacksaw was the only thing that could do it. Got that removed, and then the passenger side had a problem, seems as you must remove the oil line from the valve cover to the oil tank in order to get the back plate down into the mounting slot. None of these was a big deal, except for the fact that with no warning, it all had to be done while mounting the engine, not so much fun.