This is really the only "upgrade" available for facelifted housings if you want the clear side-markers.
BMW E53 X5 N62 4.8L > Lighting > Headlights > ES#1306805 European Bi-Xenon Headlamp Housings - Pair - 63117166815816

I think they come with the same internals though, so aside from looking cooler, the only way to really upgrade the headlights would be to tear them down and put different projectors in them like I did. This however requires A LOT of work, and beyond most peoples comfort zone.

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