After doing my research it seems there are actually two part numbers for
dealer-type Vanagon coolant:

ZVW 237 105 Is that green? or blue?

ZVW 237 104 I think this may be old part number for the blue stuff. Can
anyone clarify the two part numbers?

My van has Autobahn blue and I want stock extra coolant. Is ZVW 237 104 even
available anymore?

Will VW dealers still have this coolant anymore? I see one ebayer has this
for about $35 including shipping. Thanks.