There's a DIY on mbworld forum related to your topic. I'll post the link below but these bumpers are going to be hard to find. Hope this helps.
http://mbworld.org/forums/c-class-w2...fogs-w202.html (Front Bumper DIY)
http://mbworld.org/forums/c-class-w2...mper-w202.html (Rear Bumper DIY)