ZF Sachs, Lemforder, Boge ZF Parts - YouTube 

sachs are sachs they are originals, they're a lot cheaper because you are not buying from a dealer..

Yeah right,ok thanx steve.. ;)

do you maybe also know...why they say that u have to press the shocks a few times before mounting them on the car?

oil based ones maybe to lubricate the inside of the shock probably helps with the levelling.not heard of this method on the gas type..