Need help with power steering gear mounting nuts on K Frame

So, I got the K frame back from my welder yesterday. He was able to slightly enlarge the holes, fish the new 7/16" square nuts through from the back side using a wire, and weld into place, I'm happy with the results. I've done some research on the special 12 point bolts used on later cars, and spoke with Firm Feel about it. They are aware of the bolts, but when I asked how they were different other than the 12 point head, I was told "nothing really" and did not know about any special interference fit property of the bolts. There are some listed new on eBay as I write this, so I'll order and install them.

DSC_2906[1].JPG