To expand upon Option8's post, my local NAPA also carried the Gates water pump with the cast impeller. Looking up the part wasn't super easy but the guy pulled it off the shelf to check. It was listed as Napa Brand, TWP 42134 (Tru-Flow Water Pump), the number was the clue and it's exactly as shown above. I'm glad to have one for the reported increase in flow or decrease in turbulence for my soon to be built MSM engine. Last one I ordered was also $70 - $75 and advertised as cast only to find a stamped impeller Gates pump that I could have purchased for $33 on Amazon.