Thanks for the update! Yeah, sounds like indeed it was probably a non stock bolt that required the drilling.
So now at this point, I still wonder why the TJ amounts vs the others are different part numbers. I think overall it doesn’t matter and they offer the same fitment, but I’m curious nonetheless. If I can ever get my hands on stock YJ mounts again, I’ll buy them in a heartbeat and compare. Otherwise, I am running the TJ mounts for the foreseeable future.
something interesting is the aftermarket brands (such as Anchor) offer different mounts also, following the stock fitment tables. So one mount for YJ/XJ/MJ, and another for TJ. Now, I know those are all junk, but I wonder if holding them side by side would tell me anything worthwhile.
And finally, I hear ya on the parts. I used to throw out everything not realizing how valuable factory parts are. That was 11-12 years ago now. Now, I'm spending boatloads returning it to bone stock and in the process trying to get as many useful OEM parts as I can. Even if I don’t have storage for them.