I just took off the outside door trim. It looks great. However, on the passenger-front seat there is some mild discoloration. I was wondering if anyone had any recommendations on how to remedy this problem, or if I am SOL

 

discoloration like a stain?
if so, go to a car detailer and get your seats heat steam extracted (or whatever they call it)
you could also try a basic seat fabric cleaner from autozone

 

Its just discolored because its an 05 and it was never exposed to light. I dont know I guess i can deal with it. maybe after a while it will blend.

 

i have no idea which piece you are referring to