Welcome to the new Wizard Outboard Forum.
Does your fuel connector look like this?
or like this?
Yes, that is it. Like most of us I need the supply end (tank hose end)
From reading online, the mercury fuel connectors came in two sizes. The smaller one is supposed to fit the Scott/McCulloch fuel barbs.
Here's an example at the beginning and end of the video:
Here is the cheapest I've found it so far. They are getting expensive: