Power Steering Pump Cooler

After a couple years of driving the my 71 Scamp with manual steering I'm considering putting the power steering back in. However when I pulled it I had a cooler, that I thought I would never use so I sold it. I dont see anything in my service manual about it and doing a google search came up with some pictures, but hard to say. The bracket and mounting seemed like a perfect fit so an aftermarket unit doesnt make much sense to me.

Im wondering if this finned cooler was factory or after market and how many of you have a cooler on your power steering??

This was my old unit.


img_20130407_133858_561-jpg.jpg