From memory my factory momo has a differantly spaced backing horn slider bit, the boss could be the same as bighorn, the momo wheel is the same. I do have a couple of factory momo boss kits lying around somewhere also one to suit other type (also fit momo) but wheel was close to contol switches etc ...

Hi
just out of interest what pistons are you using for the overbore and comprestion ratio as I'm doing the same covertion.