correct spark plug help

[lostforawhile]

I'm having trouble finding the correct plug for my scooter this is a 139 QMB 50 cc, the plug that came out is a autolite 4194, the NGK it's supposed to cross reference with isn't even close, the irridium that says is supposed to fit this engine, and the ngk eqiv  isn't even close to matching the plug that came out, could this have the wrong plug factory? 

[lostforawhile]

this is a much smaller diameter thread then the ngk

[lostforawhile]

this is whats's in there, none of the cross references are even close www.amazon.com/Autolite-4194-Copper-Non-Resistor-Spark/dp/B000CSPFX2

[lostforawhile]

it was an NGK CR7HS  they didn't have the irridium in stock, but it's down anyway due to the hole in the carb diaphram