I like the electric Rostra idea so I did a little googleing. Here's a spot to check http://www.rostra.com/cruise-control.htm

After chasing a "find dealer" menu a nearby Pep Boys carries it.

I'm checking it out this week. Thanks for the tip Larry!

__________________
Rick
Avid Benz watcher

Previously owned 126's: 2 1981 300SD's, 1987 300SDL, 1991 350SDL,
Previously owned 123's: 1978 300D, 1983 240D, 1985 300D
Previously owned 124: 1994 320TE

Currently:
2004 Toyota Sequoia SR5 206k
2010 Ford Edge 122k
Always looking for the next MB diesel!