Update 2016! They work just fine if you have the correct PS pump, which I did not. Use Cardone #20-6801 with a non-keyed 3/4" shaft or other similar pump.
Based on the Grainger part numbers 3X586 & 3X573 found in no fewer than 10 threads I ordered the pulley and bushing for my Saginaw PS pump. These parts won't work with a PS pump unless it has a 3/4" shaft. I should have looked at the bushing specs before I blindly ordered and it would have been obvious this was not going to fit.
Hopefully this will save someone else the hassle of a parts return in the future.
Based on the Grainger part numbers 3X586 & 3X573 found in no fewer than 10 threads I ordered the pulley and bushing for my Saginaw PS pump. These parts won't work with a PS pump unless it has a 3/4" shaft. I should have looked at the bushing specs before I blindly ordered and it would have been obvious this was not going to fit.

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