George fyi with a stamped impeller the vanes are consideribly smaller and they have on one the one i removed from my car a 3mm gap to backing plate. I measured them with feeler guages to find the gap measure . The vanes on the steel impeller do not come close to the opening of the pump 1/2 inch from center opening. The cast impeller come to the opening and were on the pump with cast impeller i have 2mm from the backing plate. I closed the gap to 1 mm as per your sketch. Sorry were metric up here . Scott
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Scott
If you always do what you always did 
You always get what you always got  
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