it is possible but don't think the dealers are too keen. someone was quoted £135 without fitting!!
Parts are around £55 from dealer including spray paint or ebay and cool new do the already sprayed for £60-85.
Look at my gallery to see mine. I bought parts from dealer sprayed it myself and fitted it. There are numerous threads on here about fitting them if you do a search. Can send you the full instructions if you PM me your email. Takes about 1-2 hours.