One way to ensure you have the latest mic is to look at the color of the back. If its green it is the latest. I will also say that MANY MANY people have the older mics and find that they work fine. Ive tried a couple versions and the difference in gain isn't all that much. The list price is about 60-70USD and if you buy an OEM retrofit kit you should get one of these - if you don't you are being short changed. Now, you can choose to keep your own mic if its from say 2000 and newer and you will probably be happy (most folks anyway), but the older vehicles really should have the mic replaced.

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Randy...
EIS, Ltd.