For a 2010 Hyundai Santa Fe petrol (gasoline), the accessory drive belt idler pulley (the smooth guide pulley that helps route the serpentine belt) can vary a bit by engine.
Idler pulley (accessory drive)—this is the smooth pulley the serpentine belt runs over (not the tensioner). It is different from the belt tensioner pulley. The idler doesn’t adjust tension (the tensioner does) but helps route the belt correctly.