I would look under the plastic door sill which is pressed onto the sheet metal seam with metal clips, if I remember. Or just inside the sill, under the carpet.
You should be able to pull the sill up, prying gently with a wide blade screw driver or putty knife.

__________________
DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV