Water pump, A/C vs. Non A/C???

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
are these pumps NOS? If they are parts store rebuilds you get what ever impeller they have to rebuild the pump. Lots of guys trying to get the ac pump have had to order from 3 or 4 different places to get the correct 6 blade impeller. I have 2 cast iron water pumps, both were on 68 340's non ac, 8 blade impeller 4.20 diameter.