My car squeeks sometime often sometime not to often just depends on the week. I think it's the belt tensioner because i had the same problem with one of my other cars but i had a mechanic fix it. This time i would like to do it my self and i was looking at autozones website and was wondering which one i need. The whole assembly or just the main pully

AutoZone.com | | Belt Tensioner | DURALAST PULLEY

or this one

AutoZone.com | | Belt Tensioner | TENSIONER