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^ they're for all GM vehicles. the female radio antenna adapter on aftermarket stereo head units is a larger diameter than the male end that GM provides.
this adapter has a small female end to plug into the small GM male; in addition to a large male end to go into the large female aftermarket head unit end.
i did not know this antenna difference while installing my kenwood head unit until i tried plugging the car antenna to the kenwood antenna.
i had to delay my install by an extra day until i could go to my local best buy and pick one up.