The body does not have the threaded tubular bow support arms fiberglassed into the body and the 3-1/2" back and 2-1/2" down in the build manual are only a start. Does anyone have any more helpful info like pictures with measurements?
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I'll be out in the shop later today and will get those support location measurements for you. Bear in mind, I have a CMC car, but it should be the same on a Vintage and others.
OK, got 'em!
Measuring from the edge of the body at the door frame straight back to the C/L of the bolt:
The glassed-in bolt socket is 3-1/4" back and 2-1/4" down from the top edge of the body.
Both sides are within 1/8" of each other (which is amazing, because nothing else on a CMC is the same side-to-side)... 🙄
That area is carpeted over, but if you peel back the carpet in that area you may find them.
If they are there, you should be able to see them from inside the fender well.
They are not there. I can make something I just want to be sure of the location of the outer piece.
The outer part of that tube/socket has an interesting twist to it. I'll get a photo up in a rear wheel well this morning and post it for you. gn
Here are a couple of photos of the top pivot receptacle, inside of the right rear fender well (the driver's side is the same as a mirror image). You are looking forward from the rear wheel with the rear seat tub on the left.
The tube appears to enter the rear seat area at those measurements I provided yesterday, gets fiberglassed to the outside of rear seat tub to hold it in place. It looks to be nothing more than a steel tube, threaded on the rear seat end on the inside to accept the pivot bolt. The tube then goes across the fender well to the inside of the body, where it has a 90º bend in it and 4" - 6" of it gets fiberglassed against the inside of the body to give it rotational strength for when you're tightening the pivot bolt.
Here, in this photo from two slightly different angles, is the tube, glassed against the inside of the body. the metal plate you see is the back side of the passenger door latch. The 1" X 1" support at the lower left was added by me to strengthen the support of the rear frame member - It is not usually found in CMC or Vintage cars and may be ignored for the top support bracket. The driver's side is the same as a mirror image of this view.
From a slightly more vertical angle. The sheet metal screw on the left is one of the convertible top snaps (just so you know where this is).
Hope this helps......
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On my car, the angles of the threaded parts didn't match. Here is what I did with threaded rods to make them match: 
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Thank You for the pictures, they explain a lot. So now that i see the support tube i can generate that . Now that i see the pictures its the center of the tube that I am measuring?
Thanks for your time and your help.
bill