Travman -- have you contacted Powersports Outlet (used to be Encore Performance) here in Prescott, AZ? I don't know if he's still got 'em, but they were fabricating their own tanks out of aluminum until a few years ago; this bike's been in the shop at their first location for as long as I've been in town, and the concrete tank form is still there. I know they've also got a pretty amazing Guzzi boneyard & dusty storeroom full of old parts at that location.
Contact info is here:
http://www.epfguzzi.com/ - see if you can get Jim Knaup on the phone; he's the owner and knows better than anyone what's in his hoard at the old location. Matt Kellerman, who'll probably answer the phone, is the shop manager (and very fast racer) and will be far more familiar with the inventory at the new shop.
