Hi Jim,
I've attached a link to our parts catalog where you'll be able to find the right power window regulator. I've also attached a tech article from our site on installing the window regulator in case you're going the DIY route. Hope this helps and best of luck!
Parts Catalog -
1992 Mercedes-Benz 300D 2.5 Sedan - Panels & Doors - Page 1
Tech Article -
Mercedes-Benz W124 Front Window Regulator Replacement | 1986-1995 E-Class | Pelican Parts DIY Maintenance Article
-Dmitry