Honda CB750F Gas Tank Compatability

[honda_newbie]

I've got to switch out my 1981 Honda CB750F gas tank as it is completely useless and filled with rust at this point.  I'm just needing to know which tanks are compatible with the CB750F frame.  

I currently have a custom seat on the bike, so I don't think the same issues would arise if I still had the stock seat on the bike.

Any help would be greatly appreciated!