This can be very irritating. When mine broke, I thought I was going to have an epileptic seizure when driving... the shaking at night with car headlights in the mirror was like a strobe.

I fixed mine ('98 E320) with 2-part epoxy, because I'm cheap. But you have to realize that the epoxy has a different thermal coefficient of expansion than the plastic, so it won't last forever. It will last much longer if you live in a location where the difference between winter and summer temperature is only 30 degrees or so, like south Florida, but if you live up north, expect to repair it every 12-18 months.