well i went to some place to get the squeeking sound fixed on my car and the guy told me that it was a tension pulley.. and some other dude said it was my idler pulley.. now i'm not sure which one i need.. or is there only one.. and where can i get a good deal onlien for that stuff??

 

tension pulley, the one that adjust tension to your belts. Its the small shiny one on top thats about 3 inches diameter.