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RJ is no stranger to fabrication and he was listening when I told him we should leave room for some rubber insulation mat to go between the frame cradle and the fuel tank. RJ then used two paint sticks per each corner of the fuel tank to allow for rubber mat to be placed down later. Aeromotive recommends that the tank have a slight gap to the metal due to chassis flex and tank movement. If too tight to the frame, the fuel tank can become flexed too much and develop stress cracks around the weld. The rubber also prevents the steel from rubbing through the tank.