Now that you've shown the back, it seems like clear is the way to go, if you're trying to match. It matches nicely.

but the OE amber looks good too, adds that colour which is nice.

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JL
'02 x5 3.0i
-Black on Titanium Silver (354)
-Sports Package
-Smoked LED Side Markers
-Chrome Gauge Trim Rings
-Retrofit AEs (Favorite Mod)
-Front & Rear OEM 4.6iS Diffuser
-Front & Rear Fender Flares
-K&N CAI