I bought a pair of Fast coolers, they bolt up on either side where the rectangular plates are. Unfortunately I didn't have a trans temp gauge gefore I installed them so I can't tell you if there was an improvement... ... what I can tell you is the highest oil temp I've seen (and it was while pulling a 2200 lb boat) is 150 on a 75 degree day, running at 70 mph. I'm pulling a 13,000 lb 5er to Utah next month, that ought to test them better.