FLAT IDLER COMPOSITE Replaces: Ariens 73208007-052003 ENGINE PULLEY Replaces: MTD 753-0635, 756-0488 Fits 660 thru 679 series 3 9/16 inch small pulley 5 1/2 inch large pulley 1 3/4 x 1 inch step 5 5/8 inch overall 1/4 keyway 3.563/5.570 OD x .625/.75 inch Belt groove