I am looking for replacement blades for my new to me 4518 w/46" deck. It has two blades per spindle for a total of six and I am trying to find the same or similar style. The top blade has has a small hole and the other has a larger hole to index on the spindle, one also has three taps welded on it to keep lined up or in a X pattern. I can find a # on one blade it is 91-326 the only thing that comes up from a search of that # is a cub cadet 18 1/4 blade with large hole, mine are approx 15 1/2" long. Sticker on mower deck is RZAV1001027A. TIA