Yeah, I may just have to check with Moyer. The only reason I want to keep this existing tank or find another one like it, is because on this wagon, it's sort of rectanglar shaped but has large almost like "half moon" shaped indents on both sides. One side to go around the differential and the other to go around the spare tire holder, which is under the floor in the back of the wagon. It's a rather unique looking tank. This shape gives it a nice tight fit.
If it wasn't for wanting to keep the original spare tire carrier, I could just remove the carrier, take a measurement between the frame rails and put a tank in from, a sedan or something more common. But, heck that would be too easy ! lol

At any rate, maybe we'll see what Moyer has to say.

Thanks again