When my UV coat finally left the building my left headlight was as clear as a milk jug within 8 months. When I looked into replacement they were about $125 used (meaning any day they would suffer the same fate).

Looking to 3rd party options I found a set of new lamp assemblies that as a bonus added halo rings for $220 on Amazon. I have a thread here showing the details.

The options were more expensive for post face lift. I would try to find a "defective" assembly from junk yard you can cut the lens off and swap it.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)