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The shape of your impeller is normal. Replace it anyway. When you are reassembling the water pump, rotate the drive shaft clockwise as you lower the pump housing on top of the new impeller. This will allow the blades of the impeller to "fold back" into the proper position inside the housing. I use a shot of silicon spray on the new impeller to ease the reassembly. BTW, I'd replace the housing and stainless liner while I was at it. The stainless liner and impeller are usually available in a kit with new bolts, gaskets. etc. I believe the plastic outer housing comes as a separate part.