Aries on the road

I am being gifted an 89 'Americana', 87K on engine & chasis. Interior and appliances all good... The only glitch is that it was rescued from a fire and has some melted parts on th exterior; running lights, front camper window. Entrance/exit door needs replacement. Gelcoat burnt, exposing fiberglass in one leading edge corner. My question: Where can I find parts for this model? specifically: Door, front camper window. I have a local rv parts place but there is nothing even close to the 'Americana' on their lot and I haven't had much luck with websites I have found... looking for suggestions. I am a newbie, am looking forward to traveling in a rig I can afford to drive but would like it to be in good looking condidtion before I head out.