Thanks for trying to help out Streets. This particular gas tank is not remanufactured by any of the vendors I've checked with, including the links you posted. The only one close that they have are the 55 56 57 wagons, and those are different then the 49 in someway.
Guess, there wasn't enough early wagons and demand for replacement tanks on this particular car to warrant these venders tooling up to punch these out.

I may resort to having one of the tank restoration places see what they can do. The tank I presently have has a "baseball sized" hole in the upper corner of the tank, thats why I was trying to find another tank that may be in a little better shape to start with.

I think I'll keep looking for awhile, so if anyone out there knows of a tank, please let me know. Thanks