We've been unsuccessful if finding an oil tank (that we like) for a flat seat swinger frame. Ridged,no problem, drop seat the short quart model is nice, anything that follows the frame line of the flat seat is pretty ugly & bulky looking.
This tank above is the short quart with an added piece of pie to meet the seat rails. The mod wasn't a huge deal but I was blown away at what a piece of shit the brand new tank that I cut into was.
It is so crooked & poorly made in every way possible, I can't believe anyone would ever feel good about selling something like this?
American made at it's finest, straight out of Carson City.