here are pics of my install.
6.0 Trans Cooler pictures from trucks photos on webshots
i am not sure why you would need 90's. i used brass bar tube fittings in i think 3/8" NPT nut to butt.
photos should be self explanatory.
EDIT: the 90's might clean up the sweep of the tubing top make the route cleaner to the lines.
its almost 3 times as big. look at the pics i linked.