Tank

Good day again,
I'm feeling alot more positive about this project today! Whoop whoop!
I do need a fuel tank, This is the one I have.

Its so rusty inside it can't be saved really. I have no idea what bike its from apart from it being an old kawasaki motorcrosser.
I was thinking of a sportster tank or a BSA tank or some thing.
Has any one got a tank they want sell me that is rust free on the inside... and remember i'm poor