1966 C10 Original Pulleys, Brackets and Pumps

[dshntx]

I am new to the site. Have read many of the forums and learned many things thanks to the site and you guys. My question is, does anyone know the number on the power steering pump pulley for a 1966 original factory air V8? The pulley I have now (3860457) lines up with my air conditioning pulleys. Will the brackets or pump make a difference also? The brackets seem to be the same and the pumps are pretty much the same except for s.a.e. and metric.

Any help will greatly be appreciated. I can't find any parts for a factory air truck with power steering.