I had that problem several years ago myself as I also had the in-car hands free kit. That piece broke off three times in under a year. Fortunately, Motorola HQ was in the Chicagoland area and I was able to wait while they fixed it. It would have taken 2-6 weeks if I had went through the dealer(warranty). Those things break way to easily.
The car kit made it worth it until I sold the car and changed phones.