I replaced the rusted through tank on my '83 with one from a salvage yard. It
was rust and dent free and since it was an original VW tank it fit like a
glove. I paid $150 for it and it has functioned well for the 2 months it has
been in (knock on wood).
If you decide to go this route you need to keep in good contact with a
salvage yard because the tanks go quick due to demand and strict EPA kind of
stuff.

Nate Richmond
Cary, NC
'83 Westy