Crankshaft Pulley...Need Help

[gonexplorin96]

When i went to our mechanic for inspection, it passed, but he said my crankshaft pulley needs replacing soon. i will most likely do it myself with a friend who's a mechanic. but finding the part is the trouble...
its a 1996 explorer with the 4.0 ohv v6, ebay has good deals it looks like

http://www.ebay.com/sch/6000/i.html...mpt=Motors_Car_Truck_Parts_Accessories&_rdc=2

Which one, or is it any of these?^