I am currently in the process of replacing my leaking aluminum fuel tank. After much research I found these dealers: For the expanding foam,
http://www.shopmaninc.com/foam.html
And here is where I got my replacement tank from.
http://sunshinemarinetanks.com/
The tank was made to my exact specs. I was very happy with their work product, and the price was very competitive.
I found a lot of details on ClassicMako forum with pictures to help me with the work, that's one of the ways I found this forum...
RABBITFISH
Tommy, Kenner Louisiana