Select change engine and you get the option to select the CSL instead of the normal car.
https://configure.bmw.co.uk/en_GB/configure/G82
Interestingly it shows Alpine White and Black Sapphire as the two colours, no frozen grey. There is also the option for the 'normal' carbon buckets and an ultimate pack with parking assist, enhanced BT with a wireless charging pad, folding mirrors, driving assistant and comfort access - all nearly pointless in my mind but you get the HUD via this package only