You will find that Hipshot ultralights and Schaller of that style will fit perfectly and look the same. Fender uses both manufacturers in factory and so has become the standard and are interchangeable. It began with Kluson, Schaller then replicated the footprint, Fender began using Schaller on some, Hipshot began replicating the footprint, Fender even began using them on some models and somewhere in there Gotoh also got into the game. You will find variances in gear ratios but the footprints are the same.