WTB! Bosch PES3A core/pump

Bosch 3cyl A's are a little hard to come by, but we have cores.
 
I think I have one, loaned it to a buddy for mock up purposes. According to him it was the best version for compact tractor pulling, he got his info from Harts's. It's a good used pump. What are they worth?
 
That's what I need them for.
I intend to retrofit the A pumps to the kubota and yanmar engines, hoping that making a ready to run kit will help out some of the guys wanting to get into the class.
 
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