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January 17, 2021 at 12:30 am #227963
Mumbles
Participant

    The OMC 307877 and Sierra 18-7100 O ring specs are .245 ID x .155 thick. Merc/Force/Chrysler equivalent O ring slightly different at .239 ID x .174 thick. No data for Mallory 9-76509 or GLM 45230.