Swap a '71 Dart Rear Bumper For A '70 ?s

I have a '71 Dart GT (Swinger). I would like to remove and replace the rear bumper with the bumper used on a '70 Dart.
I can get a fiberglass bumper (from AAR) and the appropriate '70 lenses (from Laysons), but will have to find (swap meets) the tail lamp "housings/buckets".
Assuming I can collect the previously mentioned necessary parts, is it just a simple pull off the old '71 stuff and replace with the new '70 stuff? Can I assume the '71 bumper brackets will work for the '70 bumper? Has anyone done this before?
Please enlighten me!

Thanks,

Dan