I don't think there was a 400E Sportline version. Sportline Shocks are designed for the shorter , stiffer springs in the Sportline. I don't think they will fit your car. They also would not be a good match for the springs in your regular suspension car.

I had a '90 300E and went with the HD version Bilstein's. These did improve the handling.

Steve
'92 300E Factory Sportline with the Bilstein Sport Shocks.