Can anybody offer any advice on how I might identify a part number for the correct key to remove OEM security bolts from my 2003 C270cdi? I went to my local dealer, who had a kit of 24 keys, none of which fitted. They did advise me that their kit only covers current models, and that it may not have been correct for the 2003 models. My bolts have a slot cut in a symmetrical pattern, resembling the six petals of a flower, per this pic:
John