Power steering question

[spymatt]

Bought a new power steering pump, pulled old pump found out that pulley on old pump is trash and needs to be replaced. I have looked everywhere local for a pullley and nothing. I can find keyway type pulleys but I think that the pump I have doesnt have a keyway shaft? Im not sure. The new pump doesnt have a keyway or at least what I think a keyway is, so my question is wth is a keyway and do I have one and how do I tell what type of pulley to buy and where. The pulley I have is a 2 belt pulley.

Thanks for any info in advance.
Matt

 

[spymatt]

I guess maybe some more info.... is needed

The old pump and new pump are a saginaw pump. The Truck is 78 GMC Jimmy. Looks just like this image I found on ebay.

 

[spymatt]

Any Ideas?

 

[readymix]

junkyard. And no it does not have a key-way