I picked up a new set of tuning machines for my Les Paul Standard and I got the bushing in and the new tuner slipped through perfectly, but I discovered soon that it doesn't appear that the post is rising up far enough. The hole in the post where you slip the string through appears too low. The problem then becomes I don't think there would adequate room for the windings to accumulate.
If you go here to the Duncan forum you can see my two photos:
If anyone can post some info on what exact tuners will fit correctly go for it.