Yeah, from doing a bit of reading it's mainly the black bit around the glass and underneath it that's different to allow the bulb to be used in a non-projector lens unit as per Merc's original spec for the D2R. Using a D2S will just give more glare, most likely, as you've got light bouncing off parts of the reflector which aren't designed to do so.
My old bulb doesn't actually look in bad condition but they don't have the best light output....
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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