Jody has them at ValleyviewRC.com. He can tell you how to mount it. It uses the same two bolts that hold on the carb and reed block. Mine kept changing mixture in knife edge and inverted. I put one on 50 and 55. Works great. The fuel getting all over the engine box was not the reason I installed my first one. Although having it go bone dry once the stack was on there was a great side benefit.