TA power steering pump

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I think this may have been covered before and can't remember the conclusion, but I need to find the correct stuff for my Son's AAR. I'd like to find oem stuff. I know the pump is a federal pump and I have plenty of them from other cars. Not really looking for date coded stuff unless it comes up. I've got one on my AAR with the solid pulley but it did not come on the car. Some say the spoked pulley is correct. What is the correct diameter and offset. Did the same pump and pulley come on any 340 in 70-71 without air? They all had coolers, correct? How hard are those to find? Thanks.