It's hard to tell, but those look shorter than the OP's parts. They look like the standard '69-'72 Dart units. Strangely, there is only one part number listed for the Plymouth B-body (2-door-only) part in both '71 and '72 catalogs--though the number changed. I would expect different numbers for chrome and body-color. But, as I mentioned, I have seen the long chrome ones.
OK, the green one must be what's on that '70 'Cuda photo I posted. From that angle it looked identical to the one on the left but I did notice/mention a different part number in the catalog. That's on me; sorry. However, the catalog says the '70 A66 Challenger was the only '70-'71 Challenger that didn't use (what I now know is) that green one, which '70 Cudas also used. The A66 used the one on the left. Thanks for clearing it up!
