Motorola Bag Phone Speakerphone Kit

Does anyone know where, or if I might be able to find the speakerphone kit
for a motorola bag phone? I've got just the bag and the phone, but if
possible I'd like to mount this thing and have it work a little more like a
"car phone".
I can't quite figure out what the speakerphone kit is, unless it's just
another module that fits on where my cigarette lighter plug module fits
now..
I poked around on ebay and found this auction, would the speakerphone part
from this auction be able to interface with my bag phone?
http://cgi.ebay.com/ws/eBayISAPI.dll...7471 647&rd=1

For what it's worth, here's the model I actually have:
http://cgi.ebay.com/ws/eBayISAPI.dll...7475 366&rd=1

TIA for any advice,

Scott