I was trying to change the front pads on my 2002 slk32. I thought I would be all set removing the caliper bolts with a 7mm hex. It seems that not only is a 7mm too big, but a 6 is still too big and a 5 is too small. I didn't think the hex would be ASE. I can't seem to find any info doing a search. Can someone give me the correct size or am I doing something wrong?