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.