Classic Winnebagos & Vintage RVs

Friends, This van has trim rails at the exterior secured by screws.  I can reuse the rails but the orange fiberglass? inserts are cracked, damaged, UV faded etc.. and need to be replaced. Doubtful I can find these but would be grateful to get steered to them if they exist.  Who would custum make these.  I suppose I could paint them orange if there is a substitute availabe....i tried to post a pic but program did not seem to like that......Thanks in Advance Bill