Hi
Good luck on that one. There are people that will make one, but the cost is prohibitive.
I have a 62 also..the tank is good, that is to say : is isn't currently a leak'r. I have a spare that I picked up...rusty inside, but doesn't leak. If this was a Chevy, you could find it...right?
I had an idea: If mine starts to leak, I'm going to find a new workable Chevy tank, cut our the Dodge tank and position and weld in a Chevy tank within the mounting frame. I'm certain that I can pull this off. Buying a rusty one doesn't seem to make sense.
I hope this helps