SuperChuck,
I just had the unpleasant experience of trying to identify the transducer for my 2003 H210. It took a great deal of poking around the internet only to find out it was an airmar unit, and that the Four Winns part number is sufficent for them to identify the part.....however, because the part is in demand (for some reason, it seems that all the boats with that transducer must have a similar problem) it would take two to three weeks to deliver. Ultimately I just bought a new Faria unit which, while more expensive than just the transducer was much easier than wasting precious time trying to locate the part.
If you still want to identify it try this link:
http://www.fourwinns.net/partbook/basemodel.php?model=210H-U00BTW the folks at Faria were extraordinairily helpful.
Poke around I found my part included in the parts list for the 2002 models and not the 2003 models, but the part was the same.
Good Luck!