What o-ring are you looking for? The OMC 301877 and Sierra 18-7100 o-ring that Mumbles mentions is for the shift rod. The one Frank is referring to is for the dual hose fuel connector.
Agreed. 107’s are for the fuel connector and 201’s are for the carb’s nozzle. I don’t think there is a cheap and easy replacement for the shift rod O ring. At least I haven’t found any yet.

