That's good news, as the tether certainly increases the safety of a toddler sized car seat. In Canada, we mandated that all cars have tether mounting locations beginning in 1988, but many cars had them prior to that.
In 2000, all cars had to have the tether mounts pre-installed and the LATCH system in place.
For true MB nuts, MB Canada offers infant and booster seats (no toddler seat) that have the BabySmart system. I was forced one day to have my daughter in the front thanks to an odd load that had to go in the back seat. The BabySmart worked like a charm.
1998 C230 "Black Betty"