I just picked up a small trams cooler, bar and plate, that my local Repco were clearing out.
Apparently bar and plate you can go smaller than tube and fin, so mine is pretty small, just cable tied onto the mesh in the lower part of the aero bar.
Then when we ran the hose to the power steering pump, put this spring stuff on the hose so it would do an almost 90 degree bend without crimping, put joiners in the hose and connected the new hoses to the old.
Easy, and if there's ever a problem I can just disconnect the cooler and reconnect the stock lines.
Cooler got very warm at the last track day but there were no problems at all.
What are you doing for an oil cooler? Got the plate sussed just trying to work out where to mount a cooler, and your config should be the same as mine.