Go cart USA. It's the one they advertise for their bad ass chopper. I've read acouple bad reviews about it though. The welds are crap and break. I'm sure the vibrations from the engine and the heavy ass carb don't help much. I was thinking of either getting a rod weld from top to bottom of the mounts or cutting it in half and putting a piece of heater hose in the the coupling them together. So either stiffen the whole thing or give it some flex. Also I am having the same issue with there being some of the rubber o ring showing on the bottom of this one as well. If only I know someone who makes gaskets. They could possibly solve this problem. Where will I ever find one. :facepalm: