Cup Holder, Part number: 51169173501 $30 Shipped
Wheel Bolts (Full Set): $30 Shipped
Engine Tow Hook to hold Engine for turbo install: $18 Shipped The Tow hook that comes with the Z4 will not fit on the engine. You have to have this part if you want to replace your turbos.
Turbosmart Kompact Z4 Adapter kit (TS-0203-2001): $20 Shipped. You have to have this part in order to install the Turbosmart Kompact BOV on the Z4.
I also have a Z4 LPFP Bucket with fuel lines and ABA hose clamps. I also have a fully functional stock LPFP. $60 shipped. This is $150 used from a salvage yard and $425 new.