The heat exhanger actually is from a truck, and from what i hear its bigger than the HX for the SUVs (suvs is not as tall)
Here you can see how huge it is and covers all of the ac condenser basically...but the trans cooler is so huge it pops out more
I had a plan once to cut out behind the denali lower grill and make that functional, then relocate the trans cooler down there, but wasnt sure how it would work out in the snows we get in the winter...