Not sure on the idler pulley, looks kind of like what was on my bronco 5.0 but thats just a possibility.
Im out here trying to get this pig to start, just clicks, nothing happens. checked cables they seem ok, batterys show 12.5v (could just be surface charge, but wouldnt start when i tried jumping it w/my maxima before I bought it). Tried jumping the relay on the pass side of engine compartment; nothing. Looks like this could get irritating, time to search the forum!