Ok I am going to muddy the water. There are some engines that use a flat belt(serpentine style) the same way a v belt is used. So it could still use old style pump.
While I'm sure I could change the impeller on a water pump, I would always question it's longevity.
New ones don't cost that much for the piece of mind.
I don't even go for part store rebuilds, on water pumps.