A very hard to find item that can totally complete the package. As far as we know, this is the only place you can get them. The knobs are 8-32 threads to match GibsonTM and PRSTM switchcraft 3 way pickup selectors. They are custom made one at a time here in the shop. The profile shape, width, height, roundnesss, etc is the same. They are fantastic AND WORTH EVERY PENNY!