I have a friend's 71 Challenger in my shop that I am trying to round up all the parts to install the rear bumper. The car was just painted and dropped off for me to assemble,
As mentioned the 71 has NO filler strip, the 2pc rear tail light cover extends under the bumper, don't install the bumper if the tail lights/rear facia panel are not installed, as you need to install these first, bumper last...
Also is your friends car an R/T or base model, restoring original/custom?, as there's some black out to perform if it's R/T optioned, best to do that now before assy, is the 2pc tail fascia panel argent or black, rubber bumper equipped cars also dictate a black out on the upper bumper surface, as well as black out striping on the trunk/qtr chrome trim pcs