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

Whether it a flat top body or a carved one, the routing depth in the body top is always the same.

Mounting styles are different between the various models. There are 2 mounting styles... Stud mounting and Flat mounting. All bass trems are flat mounting and all 73xx models are flat mounting. (see Strat, above right)

Flat mounting tremolos use 4 #6 wood screws, and are simply screwed down to the flat body top, over the route (enough said here), while the Stud mounted 72xx models need the Tune-o-Matic tailpiece studs to mount up too as shown in the Les Paul (above left). The stud mounted 6, 7 and 8 string models have 2 hooks on the side of the frame as seen in the chrome 8 string (below, middle). These hooks will go around the studs just like the stop tail piece does on the Tune-o-Matic (below, left) and mount up like on the Les Paul (top left).

SPECIAL NOTE: In the 80's, Gibson's and most guitars with 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 stop tail 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 of course, 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. You need about 2-1/8" to about 2-1/4" between the bridge sections small E saddle notch (which should be set to the scale length) and the center/middle of the stop tail piece to be "in the ballpark" for mounting a 7200 without having to relocate the studs. If you have to relocate the studs on a Tune-o-Matic setup for a 7200 and its a flat top body, you can use the PL-8 coverage plate to surround the base and the relocated stud holes. Imperial drill bit set for 7200's. I always suggest a qualified luthier to do the job. See my choices for qualified luthier's.