RE: Goldberg Extra 300
When I was the owner of the GB 300 Extra, I ordered a tank from Hobby-Lobby. Model GR236. This was a 14 oz short fueld tank that seemed like it was designed for the GB. I flew with a OS 91 and it gave me 10 minute flights with lots of fuel to spare. I think when I got the tank, it actually came from Germany.
Bruce