I got a set of Gotoh Res-o-lites (GB-640 vintage style). The spacing of two rear holes is slightly different for both a Fender Japan Jazz neck and a Fender USA Precision Fretless Neck (1979-80). I would have to drill the headstocks to install the Gotohs (which my computer autocorrects to "Goths"). I can switch tuners between the two basses and they fit exactly the same. I thought these were supposed to be a drop-in replacement. Did I somehow get a bad set? Or is it expected that I will have to drill? EDIT: or could I just install with the two front screws and not use the two back screws? GB640 | G-GOTOH Ltd. Thanks for your thoughts.