I've used the Wolfstein RaggTopp with success. No silicone.
Just a guess but I seem to remember different thicknesses of the lower spring pads being available at one time. A quick check at RealOEM...
Have you checked Grom Audio? You may find the integration unit you need there.
IMHO and experience, first, get rid of the run-flats. Worst tires for the Z4. After I changed to the Michelin Pilot Sports, the car handled...
Sounds like the beginning of the well known GM5 module failure. I've had this issue. Google it. It's a quick and easy repair.
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