Bought these new. Have been used for one track day at Donington GP.
These are designed to fit the regular F-series JCW callipers on the 228hp and 306hp variant cars.
They are suitable for both track and street use.
The backing plate is ever so slightly thicker than the OEM backing plate so if you're running the OEM wear sensors you may want to tie the sensors up somewhere out of the way.
£120. Can post or bring to an NMS event.