hi i see that some cars on in the 70s like the charger and roadrunner, gtx dont have a post where the above the door jam . between the doorwindow and the back window. my 70 belvedere has this post. i was wondering what the purpose of the post is.

 

It's a difference between a hardtop and a coupe Mahd. Roadrunner coupes serial numbers will start with RM21, hardtops will start RM23. You won't find a GTX or Charger coupe. You will find Belevedere, Satellite, Coronet, Super Bee, and road runner coupes. I THINK these are a lighter weight car, but I wont swear to it. I dont remember seeing too many 70 coupes, you may want to check production numbers, you might have a semi rare car on your hands, but in any case, it's yours! Enjoy.