I've asked several different Rat Shack employees and they didn't know or even how to look in their system to find out (am I surprised? not) and I thought it was in the archives here but can't find it. so could anyone pass along this info. Thanks.
It's an EIAJ-5 plug. This would be adaptaplug T, part number 273-1723. To my knowledge Cell Phone Shack stores do not stock the plug in either adaptaplug or connector only. It is available through DigiKey, but they have a minimum order.