My race car is a 16V & I use standard suspension. I removed the pump & installed block off cover from early 190E, some mods were necessary. The stock rear springs won't hold the car up at all. Try getting a set of springs for Sportline 190E 2.6. Not much $$$ and they will work well. Use the "sport" Bilstiens as they are shorter than std rear shocks. Of course I do have a good used pump if you are interested.
MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar