I don't think so.
I had made rails that went between the two "stands" of the body. On the rails I had pieces of tubing that were cut to the proper length so as not to put stress anywhere to the body. The tubes were 1" in diameter with an end plate welded on. That end plate was threaded so I could install a bolt directly into it. Then I would use factory body to frame mount holes.
By utilizing the factory mount holes, I was able to touch in paint later as none would get beneath the mount at painting time. Once mounted with pads, etc. this "touching in" was not visible.
I have attached a photo of a 40 convertible body mounted. This should make it quite clear how I mounted all bodies. I'd restored so many coupes and convertibles, I had "stands" made respective of body style, marked as to what they went to as well as the rail system marked.