Very exepensive to buy new and would make an ideal replacement for anyone with a cracked or missing one:
http://cgi.ebay.co.uk/MERCEDES-C36-...39:1|66:2|65:12|240:1318&_trksid=p3286.c0.m14
http://cgi.ebay.co.uk/MERCEDES-C36-...39:1|66:2|65:12|240:1318&_trksid=p3286.c0.m14