I did a set though not 71 or Charger. Did it to a 72 RR/GTX. The B's are not like the E's that got a thick rubber coating. I used a high build primer with a flex agent. The B's have painted carriage bolts where the E's have welded studs. I welded and ground off the carriage bolts to be smooth like the E's. Lucky you doing a Charger and don't have to dish out 1800.00 for the Plymouth brow cap.