BMW OEM Platinum Spark Plugs Part Number?

[gwatson]

To accompany my supercharger I've been advised to run platinum plugs. I believe BMW can provide uprated plugs. Does anyone have a part number? My dealer denies all knowledge of them. The engine is a 3.0 M54 (2003 Z4 & E46)

Also, it would appear I have the Bremi coils which can "go bad" and been advised to change to Bosch. Does anyone know the part number for the Bosch coils or indeed if BMW will change them out even if the car is under warranty??

G