In 1941, Britain had an idea on how to extend the range of the Spitfire MK II so that it would be able to escort and protect their bombers from the Luftwaffe further into Europe. This idea incorporated a 40 gallon fixed fuel tank under the port wing. The only problem was that speed and maneuverability suffered. The tanks were used by the RAF’s 66, 188, and 152 Squadrons.
This set is made by a company named 3D-kits in the UK. I went to their web site and was impressed with what I saw. They have one area where you can download a Spitfire control panel that you can make into a decal and there is information that will answer most questions you might have about the Spitfire conversions they make.