So today I managed to test fit the ppk auxiliary radiator I'm repurposing as a transmission cooler, which is basically the equivalent of a setrab 19 row series 6 core. Once you've removed the headlights it is only a few more bolts to loosen the bumper support and radiator carrier. Between the carrier and the chassis there is a metal plate which has a plastic foot which the radiator sits on. This is what it looks like out of the car with the foot removed:
You can push in the clip and the foot will drop out of the bottom and the radiator will slump a bit. Now you can pull the bumper support and radiator carrier forward just enough to slide this metal plate off. Now you have to take the plastic nut/plug combo deal and stick it into the chassis from the outside. There is some rubber/plastic which covers this hole and it needs twisted pushed rear ward for it to pop in with the tab poking out the hole properly. You may need to reach your hand into the chassis from the front to help wiggle it into place. Now take the new radiator support plate with the new cooler arm and bolts and stick it on the chassis bolts. Here is a better shot of that process, though I had to take it back off to get the nut/plug thing in the chassis:
Situate the radiator inline with the support and snap the plastic foot back on while pushing the radiator up and supporting it again. Now you can secure the radiator carrier and bumper support.
From here it's pretty obvious you can bolt on the radiator. Once I get the AN fittings welded on I'll be able to see how I will route my thermostat and hosing.
Here is the part number to the support bracket, even though I found the bolts were too short: 51647154545