i was in the auto zoo the other day looking for a serp. belt for my truck. I give them this information first "2000 silverado, 5.3" They were actually pretty intellengent till this point "Sir, I'm not showing the listing for a 2k HDSS" when they said that i started ROTFLAMO "They never made a 1500 HD till like 03-04, and the did not make the SS till 03-04" But was very suprised that they could look at my grille and know it was and HD grille. Some times they are intellengent and some times they are just plain dumb asses