W126 offset is 25mm on 7" wheels, 21.5mm on 6.5" wheels.

I calculate 0.7" deeper inboard. I'm sure they'll fit your car. Crank the steering over both ways to make sure the tires don't rub something pointy. Handling might suffer from narrower tires and narrower track but I doubt you'll be testing the limits of lateral adhesion this time of year.

Sixto
87 300D