SX/SXi/SXi Pro Stock impeller pitch SX750

Anyone know what the stock impeller pitch is on a SX750?

I removed a pump from an old ski today (that was supposed to be stock) and found what seems to be a low pitch swirl cut impeller....but it's not stainless steel.... no identifying marks except it's stamped 55.

Looks like someone took a stock impeller...had it swirl cut????
 
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