If you dont have access to or dont want to weld them, I dont see why you couldnt just sandwich them between the floor pan and the captive washer nut that goes on the seat stud. Once tightened they arnt going anywhere. They are basically a jumbo washer.
68 Polara 500...LL1 Y7 M6X
69 Hemi road runner...X9 X9 M6X
69 A12 road runner....R4 R4 M6X
69 ModTop FLORAL Super Bee...F6 M6W
70 AAR 'cuda...EW1 EW1 H4X9
71 Duster 340...FJ6 V24 L6X9
71 road runner FC7 V1X M6X9
72 Rallye Charger B5 V1W
74 'cuda 360...KB5 V1X A6X9
08 SRT Challenger #234
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