Wow, dude go look at any center cap it can be replaced with a set of $5 stickers off ebay. Or you could be a real pimp and get the full Alpina set and replace them. Adapters are custom at about $250, the tires are still about $200 used and about $900 new and then the wheels would be the remaining $400..... and if you are interested make an offer.

Oh and these wheels are made by Borbitt for BMW so they are not cheap ass crappy wheels.