Thanks for the compliment. I'm guessing the best way to find out whether such a conversion would be possible in my car is to have the dual round headlights physically present, and to sit at the front of my car and figure out how to make them fit.

Like I said, it looks like the headlights alone might be the right size (leaving my grille and turn signals), but I don't know how the mounting of the lights vary. I'd love to come across such an assembly in a junkyard, but here in South Carolina, it's rare enough to see pre-'86 cars, much less the ones with the dual rounds.
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'89 244 GL -- 106,XXX miles (see profile for info on car)