I have noticed that the RAAF in particular used a "double wide" belly tank. I have not seen any USAAF or RAF P-40s using them. One can assume that as the Japanese were pushed back, they needed more range. As I recall the Aussies were pissed that they were given second line role...so much so that some of their top pilots resigned.
Special Hobby included a wide tank in the kit but they only made the tail end of the tank wider. It's incorrect.
So I took a part from my spares box and modified it myself. It was a belly tank from an old Hasegawa kit I built in the late 80s.
Here is a pic of the bad one included in the kit:
Now a pic of mine prior to primer and just before I added the "seam" around the circumference. That was difficult.
Here it is with a coat of primer. I'm trying to figure out what color to paint it. Should it be an aluminum paint or neutral gray???