I did this. I was the guy who posted a thread here a while back about the whole thing because I tried Gotoh's and discovered that the headstock was too thick (thread with measurements and photos is here:
https://forums.prsguitars.com/threads/tuner-design-issue.47827/
I found the StewMacs and the drawings showed the post should work so I installed them. No reaming out the holes was required, they dropped right in and fit into the existing screw holes in the back. Frankly they came with bushings but I believe I threw the new bushings out and just put them right into the already installed factory ones. Photos below. Don't blame me for the one crooked one, that's how it cam from the factory. The only "flaw" in it.