Why exactly do you want to install an oil cooler? Oil temp isn't an issue on these. They do tend to run warm on the guage, but they're supposed to.
Food for thought, the XR2 has a stock sandwhich type oil cooler beneath the oil filter. (it uses engine coolant) It's not really necessary even on the turbo cars.
The auto transmission is the one thing that needs cooling, and it has a pretty beefy stock cooler.
If you have an XR2, a bigger charge air cooler (intercooler) really, really helps.
Work on your maintenance first!
Oil change, coolant flush, replace the rotted coolant hoses (especially the little ones)
Change out the transmission fluid for something a little better.
Bleed the brakes.
Check your cap/rotor, plug wires, and spark plugs. Stick with OE style or Platinum/Iridium in the STOCK heat range, don't go hotter, DO NOT go with the +2/+3/+4 multi-electrode junk.
Change your fuel filter. Inspect/clean/replace the pickup sock in the fuel tank.
Then start working on upgrades.