They show two tanks on their site:
http://www.rockymountainwesty.com/Coolant_Expansion_Tank_025_121_403B_p/0251
21403b.htm  The fact that they fabricate an aluminum replacement makes me
wonder about either of these.  I'm looking for a spare since mine is 27
years old.

Stuart

 Andrew Martin wrote:

Rocky Mountain Westy does make very high quality Vanagon parts...  I'm going
to try one of their replacement tanks in the 88 Wolfsburg Weekender that
I'll be working on next month.

Andrew