In looking at new water pump options for my M103 300CE, I see many brands. There's Graf, Geba, Laso, AC-Delco, even Cardone manufactures it. Does anybody know which, if any, of these is OEM? Or if there even is such a thing for the M103 water pumps?

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1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k