It's hard to say if you'll see any difference unless you have the means to be able to measure temperatures. With the WJdiag software, you'd be able to read the temps to see if the extra cooler helps.
My opinion is it can't hurt to install one, the transmission cooler fluid can never be too cold IMHO.
From memory you're in IL so not sure what your options are, I have one of these installed on mine
https://www.pwr.com.au/portfolio/external-plate-fin ,I think this is the correct part number - PWO0527.
I purchased from my local auto parts store, I believe they export to the US so you may be able to get one from there pretty easily.
Jason