Since it is relevant, here is another alternative to M3 bushings incase someone wanst options
These are one piece & stiffer, but the price is the same as M3 parts.
I have my eyes on these ones because the reviews on e92 and m3 forums say that stiffer bushings do not cause much extra noise. The only risk is that we have e82 and not e9x so no extra noise may not be true
Other alternative are from Turner motorsport