If you strike out finding the cover in the right color, you could go to a automotive paint supply store with a sample of your color. They can mix the paint in aerosol cans. You can paint the cover quite easily. Also, once installed, that cover should be caulked with Geocell Pro RV to keep the water from getting into your wall and delaminating it. Geocell Pro RV is paintable, so you might want to paint everything after the cover is installed and caulked.
Jim & Kate
2016 Creekside 23RKS, 2014 Ram 1500 Eco Diesel
1995 Monaco Dynasty 36', 2005 Honda Pilot