Plumber by trade that enjoys a challenge...sometimes. Anyway, I've got these two occ bicycles, I purchaced two grubee star-fire kits and I've got two motor mounts and exhausts coming in from Barry out of Marion, Ohio...as of yet to arrive. Come to find out that when trying to install the rear sprocket from the kit, the nine mounting holes woun't clear the hub. The nine mounting holes are about 2 9/16" center-center and the hubs outside diameter is 2 1/2". The literature says there are two styles of nine hole sprockets, a 6mm and one for a 8mm bolt. Does the 8mm have a larger diamiter bolt pattern? I've tried contacting their Free Technical Support at 1-888-548-2453 several times...no answer. As of now, I'm going to need two complete sets that will clear the hub...chrome sprocket, two rubber isolators rings, the inside retainer plates, and I think the nine mounting bolts with hardware(they may have to be longer than the nine I have). Point me in a direction. Thank you.