About 3/4" difference in diameters. Assuming the Chrysler federal pump is used for either scenario. I have also found the pulley offset from the hub is slightly different too.
From: 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> Sent: Wednesday, May 21, 2025 10:02:02 AM To: Chrysler 300 Club <chrysler-300-club-international@xxxxxxxxxxxxxxxx> Subject: {Chrysler 300} 1964 PS Pulley
Anyone know off hand what the differences are in the pulley for the power steering pump on the A/C vs non-A/C cars?