Apparently 1999 and some 2000 300M's don't have water drain holes in their outside mirrors. My 2000 does have factory drain holes, one on each side, shown by the above photo taken from underneath the passenger side mirror on my car. The center of the hole is one inch from the door. A 3/16 drill bit does not fit in the hole, but an 11/64 bit does.

Since mine came with drain holes in this location, I can't say for sure that it is safe to drill here (and not hit any electrical or mechanical stuff), but I did insert a small drill bit 1/2 inch before it hit anything, and circling it around in the hole did not seem to contact anything closer than that depth of one half inch.





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