http://www.ebay.com/itm/Norton-Commando-Roadster-British-motorcycle-sheetmetal-gas-fuel-petrol-tank-BSA-/110784917517?hash=item19cb4bb00d&item=110784917517&pt=Motorcycles_Parts_Accessories&vxp=mtr
The price is quite good compared to other India and Pakistan offerings. It might be an option for those of you needing a replacement for your 'glass tank and are willing/able to deal with any possible fitment issues or leaks!
This is apparently a new lister on eBay and they have some nice looking alloy Ducati bevel stuff. However, a Bevelhead lister received more photos of the Ducati tank and a critical eye picked out some imperfections. Not unexpected in a hand-hammered creation, but caveat emptor!