The first time I went to the salt flats, about 85 or so, I knew immediately, when I grow up I wanna be a big shot bonneville racer with a belly tank.
The next winter, I went to shop at all the aircraft junk yards in Tucson Az. Most had no idea what I wanted, WW2 stuff has been gone for decades there.
after a couple years of nothing for sale showing up, my sister had a wealthy boy friend in NYC, a car guy, knew what I wanted, and bought 2 tanks from the Canadian surplus.
One day, a new aluminum tank in its original wood crate arrived at my house. The second one went to NY, to be hung in his garage as "art"
They were brand new, beautiful tanks, but not quite right. After some investigating, I found the closest match, a 50's vintage Sikorsky helicopter.
They had the same seam down the middle, which you need to remove the top for service, but were a few inches narrower in the belly, and about 1 1/2 a foot shorter, and mainly, the tail did not have the same graceful swoop down to about 3". This tail slimmed down straight, ending at about 5"s. Very close, but not the real deal.
Next few years, I gathered up all needed to be a big shot tank racer, a halibrand rear end, a 37 tube axle, a brake assembly from a early ford van, they have the pedal mounted on the master cylinder, all the big shots used them in the 60's.
Then...life went on, and the project never got started. they both sold at my auction 2 years ago to a gentleman from Illinois I believe, he only drove up for those tanks, and bought nothing else!
Now the real p51 tanks were aluminum. Some steel ones were made, for I don't know,
Aluminum shortage? practice drops? Don't know. Then there are some that show up from time to time that are slightly smaller. Same shape, just smaller
The tank in this ad posted by GB, looks like one of the smaller units to me. Real ones are 14-15 feet, my tanks were 13. Also, its steel. A fine thing for someone, a little high price since its not really the real deal IMHO.