Welcome to the new Wizard Outboard Forum.
Does your fuel connector look like this? or like this? Try this: http://www.ebay.com/itm/1961-WIZARD-MLM6908B-7-5HP-FUEL-INLET-CONNECTOR-MCCULLOCH-OUTBOARD-WESTERN-AUTO-/370701088682?pt=Boat_Parts_Accessories_Gear&hash=item564f81b7aa&vxp=mtr
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: http://www.ebay.com/itm/MERCURY-BOAT-FUEL-LINE-CONNECTOR-30635Q-3-1971-AND-OLDER-/280878944270#vi-content