Try     www.copartfinder.com.    if you punch in Volkswagen,  the years you
are looking for (i usually hit 1980-1991),  and your zip code- it will
present a list.   Then hit minivan or camper.  Then find a van at one of the
salvage yards that has a bumper for you, and give them a ring.

Good Luck in your search!!

Paul Bucco      ibuyvws@aol.com
1987 wolfsburg edition Vanagon
1965 21 window dlx bus
1971 squareback automatic