Help needed to identify what car these seats came from

I pulled these seats from my 67 Dart which did not originally come with bucket seats (they were NOT installed in the factory hole locations - dimples in floor pan). At any rate, these do not fit the floor at all, and were loosely installed. You can tell by the height difference between the frame mounts. Plastic covers are missing at the hinge locations on both sides of the seats. Black was not the original color either, apparently painted over the light blue or teal colored vinyl.

Any insight on what these came out of would be appreciated as I consider keeping them and coming up with a way to mount them properly. Given they are high back seats, my guess is a 70s car, but maybe not. Not interested in going back to the original low back seats that were offered for this car.

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