At that WeldingDepot site the replacement nozzle of the same size that ships with the IMIG 200's MB15AK torch is "B1530 145.0075". That's the conical nozzle with a 12mm opening- I was guesstimating and bought the 9.5mm nozzle.
In case anyone needs it I found an exploded view of the torch here:
http://www.americantorchtip.com/cata...smID=MBICb0100
...and a catalog of parts with measurements, here:
http://binzel-abicor.com/uploads/Con...2_0-v1_web.pdf
I also found out via this web search that the US Binzel factory/office is in Frederick, MD, around the Washington DC beltway and up the highway from here... how bout that.