Filler neck rubber grommet difference

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GHOST RUSTERS

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Hey guys, a somewhat related thought to my filler neck concerns… can anyone enlighten me on the difference between the two rubber grommets that come up for 63-66 A body mopars, the description for both describes it “from filler neck to tank”… I’m just looking for some clarity between the two options. I ordered and have #1 pictured but don’t know if I need #2 or where it would go… any and all feedback is greatly appreciated. Thanks!

(Currently into 1965 Barracuda fuel system upgrade and repair, new tank and sending unit, trying to clean up filler neck but it’s not looking good and possibly ordering a new one)

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