BBS RC has a centercap to hide the bolts, which the CSL wheels doesn't. I think they are more in the direction of the BBS Ch wheels.
Interestingly though, on the wheels, it says RC 338 (I think thats the number), so they might be related to the RC somehow.
Took this picture today on Ring Knutstorp in Sweden.
BMW F30 320D Efficient Dynamics in Imperial Blue
BMW E34 518i Touring
BMW E46 330i Touring (sold)
Alfa Romeo Giulietta 2.0 JTDm (gone as with many other cars)