Hi, Tomy2,
I decided to do the same thing in an economical manner for my '59 Apache. What I did was look up gas tanks in the J. C. Whitney catalog. I found a general tank type I thought would work, then contacted JCW customer service to get dimensions. The customer service people were very cooperative and supplied me with all the info I needed about several gas tanks. I ordered a 25 gallon steel tank (they had plastic ones as well) and it turned out to be just as described. I think I paid under $150, so was quite happy with the results.
Apache
