1-3.jpg[/quote]I have one of each of these pulleys... the stock one has the taper...as you can see here there are rivet differences, and the top is squared off so to speak...and they are smaller in diameter...so all you really have to do is place the so called c3 up against your stock...c3 is smaller in diameter....you have two stock pullies in that picture...he did not sell you a code 3 and needs to refund your money immediately....