I have yellowish stains on the glass lens inside the plastic headlight assembly on a 2000 Boxster. Is there a way to replace just the glass portion, which is cracked from the heat, or do I have to replace the entire unit? Any ideas or solutions would be appreciated, thanks in advance.

 

I believe you will have to replace the entire unit. As long as they are not litronic units, then they should be fairly affordable. I would look for a used pair on ebay.