Not as far as im aware, its a sealed unit. So long as its not broken you can get a headlight renovation kit from somewhere like Halfords and polish them up like new, or pay a detailer to do it. Its not a big job. Local place charges £30.
Morning. If you are referring to the complete headlight lense, then it is an integral part of the unit. It's fairly easy to renovate however I did my own, and its the sort of thing a good detailer would be able to do. Lots of threads on here if you search for headlight restoration.