I've found another couple of online images which might suggest that the blades in photo 2 of the MM water pump in my previous post are in fact the correct blades for the later water pump engine and the blades shown in photos 1 and 3 are for the earlier non-water pump engines. Note that the leading edge of the blades has the greatest corner radius.
for those with Series MM sidevalve cars produced between September 1948 and February 1953
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