The oil cooler we used the sandwich plate which is easiest route. FOr the cooler we just used one we found off an old plow truck in a junkyard. For the trans cooler we took one off some cadilac. Don't remember the model but that was a much nicer cooler one with the fluid going through the cooling fins. and how long fluid poured out of it, it seems to hold 50 gallons of fluid.

I've been using valoline synthetic dot 3 dot 4 fluid. has lasted pretty well and the synthetic doesn't absorb water as much as most of the non synthetic and still not that expensive. You'll want some kind of dot 4 fluid. You'll know how it does when you bleed it with what color it is. If you can get some air to blow on the brake rotors it will help too.