Mike, I'm sure it's the same as the one on my coach, had a leak in mine welded up last year in Idaho Falls, Id. The cooler is the outer most cooler, you have the radiator, trans then hydraulic coolers. The cooler is about 3" thick, 16" tall and about 3' long. If you want I could take some better measurements.
The trouble with most shops trying to repair a Alum rad is they can't weld aluminum worth a hoot, one reason why I now have a tig welder.