want to put a '70 bumper on my '71. How hard?

Last '71-'73 Dart lenses I needed, I got from David Azzopardi at www.tailights.com , see writeup here and here. He sometimes takes awhile to reply to emails, so if you need your parts tomorrow he's not the guy, but the quality of his work is A-number-1 and worth the wait. I also see these lenses go by fairly frequently with this eBay search.

I am fairly sure that clown whose disreputable name starts with an "L" has them, but on principle I do not give money to disreputable clowns who act as parasites on our community. For more detail, see here, here, here, here, here, here, here, here, here, here, here, here, and here.