I'm planning to do tail lights too but only 3000 wet sanding and polish.
After that, install some protective film on top.
By the way, I used some zymol wax to protect the headlights for now but that won't do anything long term , a film still needs to be applied .

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2006 X5 4.8is LeMans Blue / creambeige interior
Prod.date: 2006-06-21