1969 Dart Swinger vs 1971 Plymouth Valiant front bench
So the back DOES match the front. I have a complete set of seats from a 1971 Valiant. Both front and back had matching broadcast sheets.
In addition to potentially different locations for the releases, I think the headrests are different. No matter to us, we are keeping what we have. I cleaned the back up tonight. It is in good shape. I have a split in the driver butt area along a seam. I could use some advice on how to fix it.