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I can’t find a photo but IIRC the part # and revision are printed on the back of the headlight. Also the original design had 3 mounting brackets, and the newer revisions only have two.
Doesn't look like something that would be very easy to get to. It's a relatively fast mobile service repair for a non-functional cosmetic issue, so really no point in sweating it. Either it goes out, or it doesn't. I guess it would suck if it happens out of warranty, but not like Tesla would proactively replace it if it hasn't gone out.