I have done the RPO decoder but I dont know wich is headliner carpet, plastics etc. Where abouts are what? and any one with my same interior or know what the rpo is?

 

That is a very sharp interior.As for the RPO on an '84 you should be able to go thru PHS(Pontiac Historical Services) to get background on your car.I'm sorry I don't have the number.But in '84 the radiator tag should have the color code for your interior.It's mounted in the center of the radiator core support in front of the fan shroud.Is it silver or white and is it vinyl or leather?Camaro used sandstone grey in '84 and 60N is the code for custom vinyl and 60R for standard vinyl that would be on the radiator tag -if Firebirds use the same codes as Camaros.
Is you car a base,SE or T/A?

 

Ill right everything down, the next time I can work on it