3-point conversion help.

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No, we're not talking football here. The 3-point convertible conversion seatbelts just arrived for the '72 from Seatbelt Planet. Saw the video out there but was wondering if anyone had year specific advice. We are preparing to put the interior back to the original white so there's room for appearance enhancements if someone has a trick or two to share. Thanks!
 
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just getting into things now. Looking at the video's out there, the one thing noticed is they all lead back to a CJ's instruction video. They're using a 64-1/2 to 66 model and the metal lip on the quarter is much thinner by comparison to my '72. Once you add back in the rear quarter trim, it looks like there's no room to install the nut. Anyone experienced this and what did you do. For design/warranty purposes, I'd rather not eliminate or modify the mounting bracket and stud for the top mount. All I need is an additional 1/2" or so. Doohhh!!!!
 
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My all time favorite vehicle is our 1969 Shelby GT500
This is a very timely thread/ We have two 1973 Mustangs, one is a Mach 1, the other is a Convertible. Neither has a shoulder belt, which is how they came to us. In the vert I see nowhere in the convertible framing, or elsewhere, where a should belt would mount. With the kits I see in Seatbelt Planet I see some hop for me to be able to get both Mustangs into a safer condition - with every hope we never need to see the seat belts used for the protection of occupants in an accident - ever.
 
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Mounting them was a bit of a challenge. As a temp install, I went through the thinner metal of the inner quarter-window sheetmetal frame. It's sturdy but will bend in a wreck. Then again, the idea is not to have a wreck and while it's not as sturdy as mounting them as in CJ's video, it is better than nothing for the very light cruising we use the car for.

What I'm planning is to get longer bolts and drill through the jamb, starting on the outside (or inner to be more technical) jamb. (As in the video.) It also would be a good idea to add a small, thicker, sheet metal strap. There's clearance for it with the interior quarter panel and would add a bit of a warm-fuzzy knowing it's there. That way I can also use a carriage bolt for a more seamless look.

The next thing is to see about incorporating a Roll-bar similar to those used in the '69-'70 Shelby Convertibles. I understand something will need to be fabricated since the car is what? 6" wider? in '71-'73. Otherwise, I'd use one they sell out there or at least did the last I looked.
 
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How about a rivet nut installed into a thick metal area?
If you can also get behind the panel, install a washer for added support.
FYI... I am also dealing with this issue and since the PO installed a 1-piece aftermarket fiberglass roof insert, finding the exact location has bee a challenge!
 
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1971 Mustang Mach 1, M code, 4 speed.
How about a rivet nut installed into a thick metal area?
If you can also get behind the panel, install a washer for added support.
FYI... I am also dealing with this issue and since the PO installed a 1-piece aftermarket fiberglass roof insert, finding the exact location has bee a challenge!
I could try to measure the location on my car and let you know, but as you say, it could be a guess at best.
If you can find the original belt mount point. it should be plenty strong as it had to meet government specs back in the day.( I would think). If you have original shoulder belts with mount bracket and bolt, that bolt will be at least a grade 5 and plenty strong.
 
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