ACG Parts - H3 and California Roadster

I recently purchased 2 used custom carts built by American Custom Golf (ACG). They are 48V and have both been sitting outside unused for several years. So far a need a couple master cylinders for the front brakes plus a rheostat for the throttle. Does anyone know where I could go for this stuff other than to ACG or does anyone know if ACG just puts their bodies on frames from another manufacturer?

Thanks