I bought a set of these to replace the stock tuners on my Fender CD-60S acoustic guitar. The stock tuners worked just fine, but after 3 years one of them started skipping, so the D string was either a bit sharp or a bit flat. Happy to say that they fit without redrilling, the screws are identical in size and the screw hole was off by less than 1/2 mm, so it worked just fine.
A word of caution when tightening the locking section: first tighten the screw over the string with just your hand, which is enough to hold the loose string. Then use a thin coin (2 euro cents) or screwdriver for just another 1/4 turn; a 1/2 turn broke my new G string the first time I was installing strings. I have since found that tightening them with just the fingers is fine, too. The thing I like the most is they have very low posts, so no need to wind the string down, there is great break angle over the nut. Just lock it and tune up. For those that like to wind it, there is little space, maybe 1.5 turns on the thicker strings. To be able to have enough room to get a string in safely after installing the tuners, the headstock should not be thicker than 16mm. The caliper says you should be able to use a maximum 0.065 string size, but I was easily able to fit a 0.074 from an 8-string set.
