My 73, 77, and 85 all have the outboard 7/16th bolt mounted in a factory bung in the heat passage tunnel (directly opposite the seat corner hinges). If it were me, I'd start looking for mounting locations that are not on the seat itself - you want a restraint to keep you in the car and the seat at the same time.
Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera
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