I could use some measurements

I got the cart ahead of the horse, if you will. I noticed when I primed the inside roof of the car this weekend that when I welded my plates in the roof for the 3pt seat belts, I think I covered the 3rd set of holes for the roof bows....
Can anybody produce any measurements for these holes so I can drill them before the car goes out for paint?

While I'm begging for measurements, I ordered the dual exhaust hanger kit, can I get a dimension off the rear frame rails to the center of the muffler hanger so I can get these in too. Thanks...

Thanks man, you're awesome! That is exactly what I was hoping for. How about 1 more, what is the distance down from the top of the inner structure to the front hole? I can handle laying out the second hole based off measurements from the other 3 sets of holes I can see.

BTW, I don't have a spare shoe box, lol...