I would go with the "self locking" grovers that they have. They will fit with no extra hole drilling. I liked sperzels until I got a new neck and removed them from old neck and the cheap, soft, metal of the bushings stripped out to where I couldn't use them for the new neck. The grover mini locking are great, there's no dial to tighten, you just put the string through hole, start tightening to pitch, and they lock inside. There is a slot on top of the post to unlock when destringing. I will try to find you a link if you want