The US spec cars didn't have heated seats... at all. It wasn't even an option. I've seen one car in the US with heated seats, but that was a car that was imported from Canada.
Now, having said that, installing an aftermarket set is EASY. You can do it yourself in about two hours, three if you want to get really neat with the wiring and stuff. I did it on my old Grand Prix and keep meaning to do it on my SVX. Hey, it gets cold in St. Louis sometimes!
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