M135i/M140i front ARB 25.2/22.2mm.
This is a great upgrade for any RWD F2x/F3x. I bought this to fit to my 435d however it won't fit X-Drive models.
You can see the models this is fitted to as stock in the link below however this should fit all RWD models.
£54.99 delivered in the UK.
https://www.realoem.com/bmw/enUS/partxref?q=6792120