Went to swap out my left side window glass last night and noticed the 4 screws that secure the window frame to the regulator had some odd-ball tooling holes. They don't look like rounded phillips and an allen wrench doesn't work. I tried a modified allen wrench but after a try or 2 decided not to round out the hole.
I haven't started searching yet but figured the stovebolt would be the 1st place to start.