A few years ago I was searching ebay for parts for my ironhead
sporster.
I found an accessory fuel tank that mounted to a tall sissy bar.
It was chrome and about 3" x 9" at the bottom and tapered to
about 3" x 5" at the top.
had a standard harly style gas cap on top and a petcock on the bottom in the corner.
Deffinetly a product of the 60's or 70's.
But you could have an aluminum tank fabbed up and chromed
and mount to your sissy bar.
