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Sorry no help here. I bet @HemiSSDart can tell ya'.

Maybe........ Mr. G's Enterprises - Auto Fasteners (mrgusa.com)

Maybe check the rental outfits for one of these gizmos..........

Just some welded in plates, the front two inboard if it helps.........

Forgot to mention 3 of the 4 hinge nuts were loose from my seat frames. Just some small welds on the hex tips was all they had. I'm sure that could make some difference as well. They won't come loose again.............

Even with the spacers/standoffs the studs on my '69 tracks have more than enough under the car. Lol, maybe complaints from the assembly line made them longer. Some pictures before I recovered .........

FWIW, Instead of using the plastic re-pop spacers, I just used nylon spacers from the local hardware store. They have various diameters and thickness available.