71 Dodge Dart Swinger super six

VIN on that warranty card does say LM23C1, doesn't it?
That bench seat would be '71, '72 would be the integral headrest, would it not?
But sure as hell, there's a lot of '72 there...
And no, the marker lights do not interchange, '71 has large cut-outs or openings with a recessed lip that the markers sit flush in, '72 just stick on the outside, studs go through and speed nuts, larger hole for light socket to go through.

Great car, nonetheless...