I've been dealing with this same issue with my Nova as well. To make matters worse, my floor pans were replaced and the new pans didn't have even the bench seat mounts.
I've been working on it off and on for months. I don't want to have exposed/visible fasteners under the car. I've build some brackets that position the attachment point to the floor pan where the floor braces are. That way the fasteners will be hidden in those channels.
I still haven't come to agreement on how to attach the brackets to the floor pan. I took some weld nuts and welded them to slightly larger squares of sheetmetal. I was considering welding those to the floor pans from the top. The larger size spreads the load a little but I'm not a huge fan since ultimately the perimeter weld would be all that is holding them in.
I've been contemplating posting this same topic for weeks so this is very timely. I'll try and get some pics maybe this weekend.
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John
'71 Nova ( Build thread)
FFR Roadster
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