Where do I order fender skirts for Fleetwood?

I purchased a fender skirt for my '97 Pace Arrow from Sierra Engineering Company. They had a extensive catalog of these type of parts on their web site. See "rvpartssierra.com" It was an exact fit right down to the recessed screw hole locations.

They sent me a pre-colored skirt that matched my coach but have unfinished plain white ones that can be painted to match.

Good luck