The first six I accuired was for my son and it had AC. When he finally trashed the car beyond repair, I scavanged his basic AC equipment. There was a cast iron pulley that pressed on over the harmonic balancer and a two groove steel pulley that ran the AC which was on a heavey steel bracket like pictured in the ebay link in the above posting. Even though I have never added the air to mine, I still run the double pulley just in case I decide to do it in the future. About a year ago I mounted it on a grinder shaft and did a high polish to it then clear coated it. Not bad looking and cheper than having it chromed.