[Richbot]

The ZCP rear springs that I installed on my 08 E90 are X5 code

I think I've posted the PN's here before

The (brand new, ordered from BMW) X6 fronts and X5 rears were almost precisely 10mm shorter free length than (used) OEM X1 front/X2 rear springs from my car. My car is a low-option (premium, cold weather, manual single hump slicktop) 08 E90. The original rear spring pads were pretty smashed, which is why I think the rears only lowered the car about 7mm with new spring pads. The front lowered almost exactly 10mm