Bought these Gotoh locking tuners to replace the vintage tuners on my PRS SC245, the quality of them seems to be very good and no additional screw holes required to fit!
The locking function works well, owning other PRS guitars with locking turners this was a must have 'upgrade' for me.
These are also a direct replacement turner for the same style Gibson Deluxe / Kluson turners (check the style of them, not a replacement for the Grovers).
The box contains a tool to remove the ferrule that is currently in your guitar headstock, check you need to do this before replacing, as you might already have the correct one fitted, saving you extra work :)