I've never had to replace it, but when I intsalled my hands free cellphone I ran the microphone wire up under the panel where the switch is. That whole plastic thing with the dome lights pulls right down. Just gently pull at the front of it. It's only held in with clips. I don't know if you have to buy the whole kit and kaboodle or not, but it's easy to get too and an easy do it yourself job just from having seen it. Why don't you get one from a junkyard?