Yes, they made a converter for diesels, it was called a Trap Oxidizer and MB is still paying the price for that one. If you have an '86 or '87 Benz diesel, Benz still removes it and replaces with a complete new exhaust system, no charge. I guess it's safe to say it did not work out.
What doesn't "wash" about the diesel emissions worries, is that most of diesel emissions are particulate that falls to the ground in the form of dust. It doesn't hang in the air.
Mattsuzie, with a '79 Benz diesel that has not been updated with hardened barrels in the injection pump, you should add an ounce or two of clean oil to each tankful to prevent injection pump damage. It just takes a small touch of oil to do the job.
'01 C Class, Six Speed
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in