looking to find some rear carbon fiber fenders... been searching around but cant seem to find anybody that do them for the rear. does anybody know of a company that does. the reason im loking for those, is because my rear fenders have started to rust(was winter driver before and its a mazda so no surprise there) so fixing them would only push it back maybe 2 years and if i replace them i like to put carbon fiber will not rust and will look good to, if i do, i will start slowly to do alot of carbon fiber (hood,trunk,front fender...) so please let me know if anyone is got something.

 

seibon would be my best guess as they seem to do most other parts for the 8 hood doors trunk.

 

You do realize the rear "quarter panels' are integrated into the roof. So what your asking for is something that would just go over the existing quarter panel. Like a wide body rear quarter fender cover.
Well that really isn't going to do much for you.
They are just a bolt/glue/fiberglass on cover. You'd end up cutting the panel underneath out. Then you'll have to treat the cut metal with some kind of paint/undercoating to keep it from rusting.
To repair the car right,, cut out the rust and replace the metal and repaint/undercoat and seal inside.
Rust is a bitch. It's cancer on a car.