Rear fuel tank was mounted on early Churchill I - III , probably a inter war idea , what trooper in his right mind would want gas in an unarmored can sitting above his hot exhaust and engine deck ? Also seen on various Vickers light tanks and Valentines ( mounted on fenders ) , the Crusader , and there are pictures of Canadian Lees training in the UK 1943 ( ?) with fuel tanks mounted in place of one the rear stowage bins . Also early Stuart M3 had them in both US and UK service . The Russians had them all over the place but they were using diesel , not as flammable . There really are a lot of Brit ammo boxes , the ones you see the most seem to be the 25 pounder brass shell box ( the one in the above picture with 8 circles ) and the 2 inch smoke mortar round box . All metal , air / water tight with a rubber gasket . You can find the mortar box on US Shermans as they had the mortar installed and were issued the ammo. There are a few resin companies making boxes in 1/48 and 1/35 but nothing in 1/56 yet . I just raided my model railroad parts box for boxes of what I think are the appropriate size , if / when we get some in 1/56 I'll replace them . I keep hoping Company B or S&S add some to their product lines . With the amount of new Allied kits being proposed and released you would think this would be a great seller , of course mastering the actual boxes might be real difficult in this scale