Here is a picture of the pulley on my Prem. I'll measure it when I get it off the hoist. Looks like A/C cars have the square edge pulley and non A/C have the rounder one. This would appear to apply for long and short water pumps. Once I measure the diameter of the pully groove my bet is the A/C one is a different diameter to the non A/C one.
Fan pully.jpg
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