There are a number of interesting differences from my '67. My left tail pipe hanger was mounted with the same sheet metal screws as the right side... LOS built, factory SS 350 car. Both exhaust pipe hangers as well, 1/4x20 bolts into the threaded plates, no riv-nuts. Kind of makes me wonder if they weren't assembly line mistakes that were corrected on the repair line.
You, also, have some sort of reinforcement plates under the seat belt mounts that my car doesn't have...
