I found a similar microphone commonly available in the US here.

70-16,000Hz response. 1000 ohms

Is there any reason we couldn't use a full size microphone or is there an advantage to one of the tiny ones? I don't plan to keep any microphone permanently wired in the car. I just have a 1/8" extension cable running to my armrest and would remove any microphone after use.
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Brad B.