I just discovered the coolest thing ever. I did this on a HM Strat I'm modding at the moment.
You can just take out the studs and bushings for the Kahler Spyder trem and screw in the Gotoh Floyd studs right in the wood hole, and it's a spot on fit! No real need to actually drill new holes for a bushing. Of course, a bushing is always better, but this is just a really fast and cool way to mod a guitar without having to take time to measure and drill holes and shit.
So, I wonder if there's any cool Spyder equipped guitars out there worth looking for?
Forgot to say you have to make the front rout a little bigger to make it fit, but that's easy stuff