Anyone here know about installing car kits for cell phones? My Jeep currently has a Nokia CARK-91US car kit, for the 5100-series phone I had with Cingular. I switched to Verizon last week and got a shiny new Nokia 3589i, which cannot be used in the CARK-91US but can be used in the CARK-142. So far as I can tell, the only difference between the two kits is a couple of electronic features in the control unit and the pin configuration of the cradle. The CARK-142 is $150 from Nokia and at least $120 from a dealer, and I'd like to not have to spend that much money. What I was thinking of doing was buying an MBC-17 holster, which has a connection for a data cable and a power cable, and running it to the control unit I currently have installed in my Jeep. I'd save at least $100 in parts costs and probably $50-100 in labor, since taking out the old car kit in and putting in a completely new one would be a 2- or 3-hour job, easily. Could I do this, or am I just gonna have to eat the $100+ for the CARK-142?