I'll toss in my point oh two.. If it were mine, I'd have a local radiator shop give it the once over, verify the internal cooler is sound / pull one of the tanks and inspect the core for blockage / and develop a cost for repair or replacement. A re-core is usually cheaper and faster around my area.

And I was just thinking that the Barrio Bros. may have bypassed the internal cooler thinking they were doing a good thing, assuming and not checking that the oem cooler was working at all.

I'd prefer to use the OEM part with the internal cooler.

If you can't find a fan spacer (which I find very hard to believe!) to work with, you can always shim the radiator closer to the fan with some flat material and longer fasteners.