I sold a 60s supra a few years back that I got for $60, shouldn’t have. I got a blue olive 400 for $75 sold that one too. I recently got the 400 pictured and will not be parting with it. Lessons learned.
I know what you mean, even though most of my Luddies are Keystone
Just jumping in. Another thing to consider is, it really does boil down to the sound. If you truly dig the sound, you’re not going to be thinking about what’s not original or extra holes.
Years ago, I traded one of my old K’s for a set of clubbies. Never regretted it; they sound so darn good.
My issue was the width of the eyebolt, where it fits inside the mount. It looks like you have a stripped threads issue? I would buy a tap and re-tap the threads. It’s worth a try so you can at least keep that part original if that’s your goal.