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Originally Posted by kmaysob
how do i know which one i need? there is everal differnt ones. i have a 1983 300sd
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Check by unscrewing the antenna lock ring off and seeing if you have the toothed plastic or smooth plastic to run the antenna up and down. If it's the smooth length does not matter, if it has toothed plastic then you have only one to choose from.

It's the easiest install, takes justa couple of minutes at most. The plastic wrapper will have the install directions, I read them 3 times. I couldn't believe it was so simple to install.