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 FGT fuel tank      
The gun tractor and C60X were unique among CMPs in that they used a pair of 21 gallon fuel tanks compared with the 12 gallon standard. Here is a comparison between the two types.
They also have a large insert for the fuel gauge sender.
The sender for the 21 gallon tank is also longer, but otherwise the same. The float from the left tank of my FGT was seriously corroded.