If your truck is original paint? I would start by looking for a nice used door with the same paint code and original paint, then all you have to do is replace the door. You could put a wanted ad on mud and facebook or check with places like spector off road.
My steering wheel from JDMStan did the same thing-it was oak/tan and looked like a new one when I received it but now it has turned to grey? Well not really grey but the oak/tan color has faded away,it matched the airbag when I installed it about a year ago.
Nice air cleaner for 79 fj40.
Sandblasted and primed with black epoxy primer.
Top coat is Hot Rod Black urethane.
Sticker included is for a 79 but not attached.
$600. Plus shipping