You did not mention if the Sportline was a auto or a manual trans. The manual trans sportline uses a 3.27:1 non-lsd diff (unless it has ASD) and the auto uses a 2.85:1 non-lsd rear diff. The 16 valve was available with the 3.27:1 LSD diff in both the auto and the manual and was also available with and without ABS.
The lower front a-arms are the same between the two (actually W124 parts) and the brakes are the same, although I believe the 16 valve uses the R129 hubs (for the larger wheel bearings) and the Sportline uses the W124 hubs, but the rotors/calipers are both from the W124 300E.
I don't believe the springs/shocks are the same as the 2.6l motors were heavier than the 16 valve motors, so its safe to assume the shocks/springs are different. The 2.3l Sportline may use the same shocks/springs as the 16 valve but I don't know that for sure.
Both of these 190Es use the quicker ratio steering box.
The 190E sportline has a smaller diamater steering wheel than the normal 190E and the 16 valve.
Thats all I can think of at the moment
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