As far as I'm aware, all Z4M Roadsters have clear third brake lights. All Z4 Coupes (including M) have red third brake lights.
I've seen non-M Z4's with both red and clear, but I'm unsure if this was tied to model year, LCI, or just the owner's swapping them when they cracked.
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E46 M3 Coupe 6MT Jet Black/Cinnamon GONE
E85 Z4M Roadster Imola Red/Black GONE
E90 M3 Sedan 6MT Jerez Black/Fox Red GONE
E86 Z4M Coupe Interlagos Blue/Black
E92 M3 Coupe 6MT Interlagos Blue/Fox Red - Build Thread
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