PURCHED THE SERPENTINE PULLY SYSTEM FOR A CHEVROLET 454 FIRST THE PULLYS CAME IN DAMAGED AND OPEN BOXES.CALLED TO REPLACE TOOK SEVERAL WEEKS AFTE SENT BACK TO DETERMAIN WHAT TO DO .I WAST TOLD THAT THEY WERE SENDING NEW ON I DECIDED TO GET ALL THE AC COMPRESSOR,PS PUMP AND ALTERNATOR ON INSTALLATION ALL PULLYS NEEDED TO BE SHIMMED WITH SEVERAL WASHERS TO MAKE CLEARANCE ISSUES FIT CRANK PULLY HAD TO BE MILLED DOWN TO FIT.ONLY ALTERNATOR WAS JUST A CHROME ALTERNATOR FROM ANOTHER SUPPLIER DID NOT MATCH OTHER PULLIES ,WATER PIMP BACK PLATE WHITCH WAS NOT INSTALLED LEAKED AND GASKET NOT AVAILABLE WIOLD NOT RECOMEND PRODUCT TEC SERVICE NOT TO BRIGHT HAVE TO FABRICATE TOO MUCH User's recommendation: DONT BUY PRODUCT.