rear bumper question

I have been tempted to try. The indentations for the rear bumper in the quarters of all 63-66 Darts are for the contour of the 63-65 bumpers.
The 66 bumpers are shaped more like the 67's and allways are mismatched.
Where would you put the back-up lights? 66 is the only year they are in the bumper. I wish someone close had a early bumper to try. toolmanmike