Thought I was dead in the water as far as Cruse control switch's go mine didn't work. I tried every were and could not come up with any for my 1992 W250. So I took them apart it turns out that they have just a micro switch inside that goes out. Found some on ebay for $1.74 each I had to buy ten but that O.K.
If this works I'll let you all know. The part # is D2F or D2f-T OR -F, DO NOT GET ONE WITH A -01 of any sort.

 

Thanks for the heads up, did the switches fix the problem?

 

I'm also interested in how that works out.