Okay, So now I've seen 3 A/C pumps and one non-A/C pump.
All three A/C pumps had 8 vane impellers and two outlets on top. The only other difference was that the back side (engine side) casting for the water passages was much deeper than the non A/C passages.
The Non-A/C pump had three outlets in the top surface, and the aforementioned shallower passage casting on the engine side.
Interesting.
CE