Hi, I'm new to the forum, I have a 1972 Challenger, rally, 440 mag, 4 spd. I need to install the shoulder straps for the seat belts. Awhile back the car had a new headliner installed but not the seat belts. I know it bolts in but any advice or guidance out there for finding the right spot?

 

The easiest is to use a straight pin to find the mounting holes through the headliner. Once you find them, mark the location and make a SMALL cut through the headliner, just big enough for the bolts to go through without causing any ripping. Then put the trim back on, and you should be set. Good luck!