I installed Akebono ceramic pads on the 535 yesyerday. The front 850i single pot calipers took the pads for the v8 x5. Hawk identifies this pad dimension as #325, used on all (front) x5's, e9 m5's, e39 540, e38 740, & the 850i .
The new Akebono pad matched up to the old Hawk ceramic pad that was on the car & fit well.