If by "fit" you mean sliding right in without carving the formers, the answer is more than likely 'none'. The stock cutout are for a 500cc (~18Oz.) tank, I believe, so no 24 Oz. tank is going to fit.

But... cutting the formers are not all that big a deal. Just be sure to cut no larger than necessary. Glue on plywood reinforcements or fiberglass if it makes you feel safer. You're already slapping on enough additional weight with that Moki that another 1/2 Oz. of former reinforcement is not gonna make a difference.