At advance they're both listed under serpentine belt, one says main drive, the other says supercharger.
Also, make sure they're looking it up under the supercharged 3.8L, so many people have an attitude that "they're all the same" and just hit the first option that comes up.
The guy that didn't understand what to look for needs a kick in the ass, didn't they even try to help you?
I hate that so much with customer service people... Sorry we don't have EXACTLY the words you said, bye.
I always ask questions to figure out what the person is really looking for, or what we might list it as.