Thanks, 428.
Interesting to me is that while a 15/32” belt width is specified for these pulleys, the 3/8” belt fits so much better. The 3/8” belt was much more easily sourced too.
I’ve attached a few pics to show how the 3/8” belt seats perfectly into the water pump, crank, alternator and A. I. R. pump pulleys. Zoom in on belts to see fit detail.
Thanks again to all for advice.
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