The cover is not available on it's own unless you find it second hand from someone. If you are looking a brand new lights, though, there are aftermarket companies making OE replacements these days... the price is not a ton cheaper than Nissan, unfortunately.
If you do end up replacing it, you could practice the process of baking/opening on it before doing the same on your own lights. If you're not interested in that, send it to me so I can =)
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