yet another vortech question

I am getting ready to install my vortech in about a month so I was going through the instruction manual and now i've got a question about the pulleys. In the manual it says to install the vortech supplied plastic ribbed idler pulley (below the bracket) but since i bought my kit used i didnt get one. well as some of you know on a 2003 gt there is already a ribbed pulley there. So do i need to pay the $50 extorsion to get one from vortech or can I use the stock pulley? $50 isnt much but its just ANOTHER thing that is eating away at my budget. thanks.
 
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The stock one isnt the same size. You just have to pay that price. If you order it from Superchargersonline.com be very careful. Their parts numbers and descriptions are incorrect for that particular pulley. I ordered by part number and STILL got the wrong one sent to me..