Does anyone here happen to know were I could find replacement door panels for a FC? Mine are starting to rust.

 

The outer window trim is still available new from Mazda. They aren't terribly expensive. I believe the part numbers are:
FB01-58-810 for the right side
FB01-59-810 for the left side

 

Actually, I just recently bought the left side trim piece for my S5 coupe (p/n FB01-59-810). I think it cost me around $40.

 

Use a plastic pry tool under the part at the rear of the glass/door. than keep prying under and towards the front. it will eventually release and can be slid back and out. You should not have to remove the mirror. These parts are avail new as mentioned.

-M