X2 on the Lexan to get you home. Dealers will have no clue. Only place in the US that has the parts listsings for the van was Europa in Santa Fe. Doubt they have it anymore. Maybe the Unimog dealer in the NW will have the listings. He sells the bigger vans (508d)
As a last resort, you could drive home in reverse.
Seriously if you don't want to go the lexan route, rent a Uhaul and a car trailer.