If your after a LSD you can get a Quaife ATB BMW Limited Slip Differential for $4200 from
http://southernbm.com.au in Melbourne...ask for Andrew....he knows his stuff
Also if you can arrange a shipping company from the USA
http://www.getbmwparts.com/partlocat...egoryID=217024 have really good prices on original BMW parts
I also got a quote for all black grills part number 51712336815 and 51712336816 from my dealer for 139.72 each inc GST
I hope this info is useful