Those are 16" rims....
I used Koni FSD dampers on my E91 wagon for over 5-years, and that was to improve the ride quality on bad roads. I researched the subject and the Koni FSD appeared to be the best on offer to soften and improve the secondary ride quality, without losing primary ride control. I'd do it again if necessary. I was running 17" wheels with non run-flat and the Koni FSD, one of the best riding E90/1 cars I drove.