I was washing the ride yesterday and looked up and saw a small radiator looking deal on the driver side mounted vertically. it looked like the tubes on the bottom went to the power steering fluid area.
I am pretty sure the transmission fluid coolers are mounted horizontally and more in the center of the radiator area.

wanted to confirm what this was

 

I believe it's a PS cooler. Apparently rack & pinion must run hotter than the old recirculating ball PS.

You're right that the optional tranny cooler is on the psgr side.