I'm mounting an HT engine to a Micargi beach cruiser, and my frame tube is definitely wider than the bracket allows. I'm going to have to drill into the frame apparently, which I wanted to avoid. The kit came with some extra parts for just this purpose, but the metal bar you're supposed to bend is just...way too bendy. I really can't trust that. The alternative is a pretty thick piece of steel with three holes. The ones on the outside screw into the engine block and the one in the middle screws into the frame tube. This looks good to me, the only problem is the picture where they do that shows the bar flush with the tube and on mine there would be some gap. Still looks more stable than the bendy bar assembly...