3925522 smog pump pulley

[gary]

Hey Guy's, There are a number of 522 pulleys on ebay that say orginal. Some have the 522 part number  and the S at bottom but some have  AO at the end of the 522 part number. I know the repo doesn't have the S on it but Why does some of these so called orginals have the AO at the end of the part number and some don't. If I am going to spend this kind of money I want the correct one. How do I make sure to buy an orginal assembly line 522 pully. Any low mileage orginals with pully that can give me some onfo.  Thanks Gary

[Starship]

6 years and almost 1600 views. Anybody know the answer??