P/S pump

[bidibronco]

I can't remember where I had seen it but I have seen the siginaw P/S pump and was wondering if anyone has a picture of one? I thought I had the stock P/S pump until I had seen a pic of the siginaw and now I'm not sure and I can't remember where I had seen the pic either. I hope I spelled that correctly and hope someone doesn't mind helping me out. Also, what is the main difference in the pumps and why is one desired over the other? Thanks!!!

 

[Seabronc]

Here is the one I installed this spring.

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[bidibronco]

looks like mine but with a V belt and I have the serpentine belt. What is the benefit of having this P/S pump?