All Kahler tremolos need a shallow surface route in the body.

Whether it a flat top body like the strat (below left) or a carve one like the Les Paul (below right)...

the routing shape and depth, in the body top, is always the same: 2-5/8" wide by 2-1/2" long by 1" deep (below right). However the screw holes you need will differ in size because the 7300 flat mount model uses #6 wood screws and is simply screwed down to the body top (enough said here), while the 7200 needs the Tune-o-Matic tailpiece studs to mount up too as shown in the Les Paul (above right). The only Kahler model that does not need a route is the flat mounted 7330 Fixed Bridge (for flat top guitars only).

Stud mounted 6, 7 and 8 string models have 2 hooks on the side of the frame as seen in the chrome 8 string (left). These hooks will go around the studs just like the stop tail piece does on the Tune-o-Matic (above left) and mount up like on the Les Paul (top right).

SPECIAL NOTE: In the 80's, Gibsons and most guitars withg Tune-o-Matic bridges, had a standardized installation location that was programmed into the routing machines at the factory and in those days, Kahlers were a drop on perfect installation. But since the late 80's - early 90's, the stoptail part of the Tune-o-Matic bridge has been shifted around like the grills on a chevy over the years. The bridge part is always in the same place for the scale range, but the tail piece is not as important. It can go anywhere since all it does is hold the strings. Unfortunately the Kahler needs these studs to mount on and since they are no longer in a standardized locale, the studs usually need to be removed and relocated in the right spot. Rule of thumb... If its years 1984-88 and Gibson, your generally good to go. Any other years... you have a 50/50 chance at relocating the studs. I always suggest a qualified luthier to do the job.