The replacements showed up Thurs. and it turned out to be one of the headsets was bad.
The replacement student headset is different and has a different part number. The replacement has a shorter boom and it's stays where you put it better. The wire, which is thinner, exits the speaker at the bottom near the boom which is nicer. It looks like the one at this site, and all the other sites in the previous thread that showed a pic of the student sets:
http://www.fast44.com/chhjin.html
I tried to get an explanation about the two different versions, such as is one been discontinued in favor of the other, from ChatterBox USA and although the conversation was confusing I think that the one in production at this time has the longer, wimpy boom with wire exiting at 9 o'clock.
In any case, the one with the longer boom, while not very good if just stuffed up in the helmet, does allow me to place it in the ear pocket of my helmet and route the boom under the removable cheek pieces and still reach my mouth. This is better because it doesn't painfully mash my ear like both do when just stuffed in place. Of course I don't know if that'll work volume wise until trying it out on track.
I'll let you all know my impressions after actually using it on track.
Steve