I did the entirety of the suspension on my 190E Sportline, really wasn't that bad except for finding a shop to press in new bushings (I didn't want to deal with that myself). I can't remember if I replaced both flex discs but I replaced at least one. Suspension work is easy, best to have a helper though. Much easier than working on an M103.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.