Thats bs man. The guy (or girl) told you wrong my friend... There are 4 different belts, depending on the combo between powersteering and air conditioning.
#1) without a/c without p/steering (depending on belt manufacturer but should be around the same code) which is 760K6
#2) with a/c without p/s 735K6
#3) with a/c with p/s 812K6
#4) without a/c with powersteerin is 747K6
I hope that helps you out a lil bit more. Take that info and rub it in the parts persons face!!... I'm a parts girl too, but belts.. C'mon they're basic stuff.