Hello Everyone: I am Willie from California. I am trying to replace the fuel sending unit on a ford mustang (68). My question is regarding the O-ring. It seems like it is either too small or too big. Where does the O-ring actually go on the gas tank in the grooves? On top of the sending unit.....It seems too small to stretch to the edges when I do this? The diameter of the o-ring I was sent is 2 and 1/2 inches. Thanks. Willie Monterey, California
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