The proceeds from the sale will be donated to Wallace & Gromit's Children's Foundation, which supports children's hospitals and hospices across the UK. Bids had reached £6,000 when Third Sector went to press.
The van has no MOT and has been left in a garage since being restored in 2005.
"I've always been a fan of Austins, and this particular vehicle inspired me to come up with the Anti-Pesto van in The Curse of the Were-Rabbit," said Park. "The van needed to be big enough to transport Wallace's invention, the Bunvac 2000, but slick enough to go on high-speed chases after the were-rabbit. The Austin was a perfect match."
To view details of the van, visit eBay and search for "Nick Parks 1958 Austin A35 green van".