Just mark where the longest bridge saddle came to with the old bridge, and hen line up the new one. At most, you'll have to drill a few new holes. If the old holes are exposed, just paint them black so they don't stand out as much.
EDIT: Or, you could figure out what type of screws the saddles are attached to the back of the bridge with, and go get some longer ones. That should work fan-freaking-tasticly.