I have used KYB, Bilstein, Sachs, and Koni. If you buy the KYB, IMHO you will regret it. I found them to be very rough riding, the standard shock to me was stiffer than the performance shocks I had on the car. I would go with the other 3 before I bought another KYB.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E