I have brand-new Eibach lowering springs for sale for the Z4M. Never used, never installed. These are going for upto $360 online. Save some money. I am willing to ship! Shipping costs not included, they vary and buyer to pay shipping.
I used H&R springs instead, they are brand new, never installed.
Specs:
Eibach Pro Kit Springs - Set
Average lowering of .8" F and .4" R
Mfg Part #
2095.140