Hi Dynomax,
I happen to be working on my 65 Fastback and this part of my car is wide open, so I took the opportunity for some photos and measurements. I don't think it would be too hard to fabricate this bracket. I'd tackle this with a piece of 11-gauge steel, a jigsaw, vice, drill, ball peen hammer and some files to smooth it out.
The floor area where the bracket is welded slopes back from level at 8-degrees. The wall behind slopes back at 19 degrees. I created a 3-view dimension drawing for the passenger side bracket. The driver side is the reverse.
I suspect it would be pretty easy to find someone who can weld a bit better than was done on my car.
I don’t know if you will find this useful, but it kept me entertained for an hour or so. Smooth roads!






