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There's an additional light in the new rear tail lights for adaptive braking which is a feature only on the facelift X5's. Since your X5 is not equipped with this feature, there is an adapter to the wiring harness to light this extra bulb as a brake light, so you essentially will have 2 active brake light bulbs per side.
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Where could these adapters be purchased? I have swapped mine to clears, but now I have a "check tail lights" warning on the dash...