MB Doc,

I have finally gotten around to working on my ('90 300E) alarm problem. Removed driver's side door lock (the lock causing alarm to go off) and examined - including with a magnifying glass. Could find no PN on lock, but I can easily remove the microswitch from the lock (it just snaps off and on). Where would I actually look to find the lock PN? (I use same key for all door/trunk locks and ignition, so I presume any prior replacements had been done using MB dealers - most of records I got with the car show dealer work.)

I could just take switch into local dealer for replacement, but wanted to try Fastlane first.