AC vs Non AC Water Pump Pulley - 71+

I'm switching to an electric fan and to gain some extra room I'm sorta following this guide to make a short nose water pump, but going as short as can bore the WP housing.

How to: Short Nose Water Pump

I need to shorten a pulley as well, and I'm considering using one of the shorter AC WP pulleys, but I need I'll need to tailor my bearing choice to the pulley if I go that route.

Anyone who has one, can I get an overall height, or if someone has both or knows the difference in height, that would be helpful.

Pic for reference (credit to @abodyjoe )

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