I have dropped the correctly sized Gotohs into existing Fender holes, but I had to use the original Fender screws. The Gotoh screws were smaller all around – head size, diameter, and length. Maybe they are available with U.S.-sized screws (or a close enough metric equivalent), but I'm not sure. Klusons should be direct fits in every way, though I cannot say for sure. I would contact the modern day Kluson company, which is in Florida, IIRC. They are a small enough company that they are easy to get a hold of IME. I believe they are owned by, or at least affiliated with, W.D. Music. Or maybe they just happen to be neighbors.