These are NOT mine & I ran across these, recently. Only thing about these is that they are a little large. If someone is going to try to take their H.T. cross country, [ God forbid ] these might be handy. Or, these may be great for another project. I think these are about 3 gallons.
http://saturnsurplus.com/miscpage/fueltank.htm
http://saturnsurplus.com/miscpage/fueltank.htm