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Fuel lock ring and gasket question

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Old Jul 16, 2021 | 08:52 AM
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Fuel lock ring and gasket question

Hey guys
Have an 88 IROC with 5.7 motor. Am replacing the fuel pump and sending unit and want to have all the items i need ahead of time. I assume i should replace the O ring on the fuel tank when i replace the sending unit. I am looking on Napa website and they list 4 different sized gaskets for my car. One is 3 1/8, one is 3 7/8, etc. Anyone know what size i need? Thanks as always.
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