It’s a simple rule, folks. Can it be that hard to follow? Never put rectangular headlights in a car that came stock with roundies. Just don’t. No exceptions.
You sort of want to avoid cars with rectangular lights in general, though there are some notable loopholes.
However, it’s fairly steadfast that you don’t want to put wire wheels on an El Camino, unless perhaps it’s a ’59 or ’60.
That is all.