I need a part number for a power steering pump pulley (keyway) for my GM serpentine belt setup. Not looking for chrome.

GM didn't make one. The serp setup came out long after they switched to press on pulleys. Maybe aftermarket makes one but it's likely to be aluminum or chrome.

By chance, will the pulley off a later Astro Van 4.3, V-6 work for you??

I figure the pump shaft SHOULD be the same size in both applications UNlLESS the later one went metric??

Should be a a dime a dozen in the Boneyards nowadays..

pdq67

A local yard is pulling the pump assembly off for me this week so I'll have everything I need. I bought a new pump but its the older style and I don't know if an older pump will work on a new serpentine belt setup. Bolt patterns and all.