I hadn't noticed this thread until just now but I can definately say an Allparts 3 point will fit on a Gibson or an Epi with only minimal filing on the bottom of the two outside post mounts, the spacing should be fine. My purple 'Bird had an Allparts on it when I first got it, I later replaced it with a new chrome Gibson part. The stud inserts from Allparts and those on Epi's are eh, no so good, they don't countersink into the body and have a "lip" that raises the bridge up as well, I'd look for some Gibson parts here if the originals don't fit your new mounting posts. Don't know if this helps too much but........