i've got a les paul with locking grovers. they were already on the guitar when i got it, but i know they were direct replacements for the original machines. of course, not all gibsons have grovers. i've got a couple of other guitars with the sperzel tuners, and they are excellent, both the locking and non-locking ones. they're the best locking tuners i've seen, although it is a fairly short list...