Model B 4 cyl water pump?

[G.M.]

I got a couple pictures of the 36 water pump on my 32 B engine
this afternoon. It appears to have a plain stock 36 pulley. I thought
I used a V/8 pulley with the 4 cast boss's that hold the fan on but
that was not the case. It looks like I made an aluminum adapter/
spacer over 30 years ago and just don't remember. I'm not sure
what the 4 bladed fan is from but it runs true and is good and
tight. G.M.