you also need different hingepin holders, front top plate, front chassis brace, and maybe a few other parts as well. i went through this with my H7 when i went to PBS. i prefered it to the C-hub for racing, because i found it to be more durable, and easier to adjust castor. you also have the bonus of being able to adjust track width. IMHO, keep the PBS for racing. only if you find a fault in it next season, should you change. and if you decide to do so. the best place i found to get the conversion is on ebay. there are guys that part out these buggies and will sell an entire front end for dirt cheap brand new. you usually get all new hinge pins, and even a gearbox in the deal too.