Although they are pull start I use a starter box for ease, which is soooooo much better.
The LHS said that both motors would accept the clutch and I would need to shim to allow room for the larger pull start, so you're right on the money there.
I'm undecided if to go with the RB 12 Pull Start or the RB V12 (bump start).
Does anyone know how much better the V12 would be over the pull start, if at all????