John back on 3-1-14. EKN member Joseph Bath had a odenthal Kt100 mount for sale in the classified parts section on here. Not sure if he still has it. No one makes mounts for the (125mm Tony//Kart spacing) that I can find any more. But you can find them on EBay every now and then. Since there’s no room to mount the sprocket on the inside you could always go to a jack shaft set up with a 4cycle. You could also install a short length of 32mm tubing alongside the tube that has the right side seat mount attached to it. This will now give you the 92mm International Frame spacing. Then you should be able to use any off-the-shelf mount you need. I hope this helps and makes sense. I to have a Extream Chassis. I know what you are up against.