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Vehicle Information: Year: 1989; Engine (Size, Modifications): 3.3L; Total Mileage: 54K;

What type / kind of headlights are O.E.M. equipment for my 1989 Turbo coupe ? (eg ) H-2 , H-3 , H-4 , etc., etc., as my friends 1987 930 coupe has ones that designate "H-4" right in the center of the Bosche lenses , and I thought 1989 cars used the "H-4"s , however mine are differant than his , as the bulb inside is a much larger ,rounder " size than of what is in my units? ( mine are very small "plug-in" style bulbs , like that of cars/trucks of the late 90's. Please clarify , when Porsche changed / upgraded to different headlights and the advantages , thanks

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