All you need is a Mercedes ebrake pad!! ..part #(A 203-430-00-84 ) Then trim the pad to look like this:
stocker on left...modified Merc pad on right. Trim with a exacto knife exactly as shown. Then apply two layers of 3m double sided tape and apply the same as the oem pad. Be sure to push the little knub you trimmed through the little space on the side of the ebrake arm and push hard to set the 3m tape.
Then you get this