Since you have the seldom seen adapter ring with the nuts welded on top, they take the larger thread bolt ( your style shown on right, smaller thread more common underside nut on left ).
I went to do some measuring of mine tonight and realize mine has the smaller 10-24 machine screw thread. It does measure .500 square and between .156-.166 tall, just depends on which one you measure. I'm having no luck finding a piloted weld nut with this big of a square. Don't want to try and make them, it would be almost impossible to duplicate. I also took a picture of the bolts that were in my bubble, can anyone tell me if these are correct.
Thanks
Dan.
