Well I just received my new 3.2 IMS tank and Raptor fuel petcock. After reading many old threads I see there is a possibility of leaking fuel where the petcock bolts to tank. The Raptor petcock has a small gasket built into it. The IMS tank came with a larger gasket. Is it best to use both gaskets? What have any of you used to prvent leaks? Thanks in advance, C.B.