Can you get just the plastics for a wing mirror of a peugeot boxer 07?

I have a peugeot boxer 2007 and have recently cracked the wing mirror though cracked there has been no damage to interior wiring, due to the contained electrics they are very expensive to replace fully and i have had to do this many times. Is it possible to just buy the plastics, take off the outer layer and clip a new non cracked cover on? If so where can these be brought?