Update: I ended up purchasing a pair of Dutch military heavy duty tanks from PA Blanchard. They come complete with drain plugs, filler caps, and the telescoping fill tubes. Check 'em out:
http://cgi.ebay.co.uk/Land-Rover-Mil...128201004r2929
Thanks to everyone for your input.
Hmmm how much do you want for your leaking tank?
My brother and I always say, "It's only money." Some day I'll convince myself.
1982 SIII 109 RHD petrol project.
Received the Dutch tanks, and they are certainly heavy duty. These things weigh a ton! They are also single wall at the bottom, so that should eliminate any possibilities of rust. They are also a slightly smaller tank - don't know why.
One was damaged in shipment - both mounting flanges were bent. After a few hours of work, the flanges look good again, but will require some paint work.