I'm trying to find out what type of fastener holds the tail light housing into the rear bumper of a 1973 Dodge Charger. Thanks in advance.

I don't have a pic, but they used a two-piece plastic rivet type thing. I'm thinking something similar for late-model cars would work just as well. You could use 1/4-20 bolts & u-nuts, too, like on the 71 & 72s.