Sorry Rick, Guess holding the tape measure over the backside of the hour meter "just wasn't good enough". Thought I was trying to help rather than hurt. I guess I shoulda tore apart my complete panel with meter, mic'd the Outside diameter of the hour meter, figured in the U bracket clearance, and gave that overall dimension. and then Mic'd the inside diameter of the panel so everything would be N.O.S. measurements. Or, I'll just stay quiet next time.