We use two pieces of 1/8" x 1 1/4" flat steel bar stock. Lay out the mounting holes, bolt both to the cooler and then lay that on the V bar using the PS cooler as a reference. Mark the V bar, clean the paint off and weld it up. Series of tack welds work best since the tube is very thin. After that, the whole mess goes back in the grill. It is easier to pull the grill than break the AC condenser loose and mess with the AC recharge.
We set them up with a custom fitting I make to drop out the IN line on the right side lower port. Fluid needs to go in the bottom and out the top to prevent an air lock.
The fluid routing overall is from the trans OUT port into the radiator, OUT the radiator to the lower right side port on the cooler, OUT the upper left side cooler port to the return line back to transmission. It is easiest to mark and drill the left side air dam and take the OUT line through that.
Depending on which ports you have in the radiator, we can help convert those to AN.