OE bushings...lemforder...or you'll be back.
Read some more, a lot more about bushings. Unless you're planning on replacing a lot of more stuff to have a smooth ride, OE.
Maybe you can search to see if. there's an M bushing that will fit. your car.
But what do I know? I'm not really a bmw engineer; you probably could just toss any type of bushing on, even Delrin or solid aluminum (yes, somewhere they make these!).
Ours are made the way they are for a reason. If you want to drive a bmw and know how one is supposed to handle, go OE, and wash your car for even thinking about Poly!
Srs, though. I think you should seriously consider ignoring popular wisdom and just trust me!
Read about 100 of my posts and 100 of the posts from others here and then decide. BTW, some of those posts you see that make you wonder? My 15 year old got on my PC and did those...especially the ones on Furries.