I'm pretty sure the WAFO radiator Cathar's using started out as a small car radiator.
Here in the states they are pretty much all inconveniently big and heavy. The ones I've seen (but it's been a number of years) are fairly air restrictive, but that might not matter with comparatively low air velocity (lots bigger so lots more parallel air passageways).
Then there's the header tank modifications you mention, and the fact that many modern rads are made of aluminum - or even an aluminum core with plastic header tanks.
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