Aka, Nick says on the other thread that they aren't. That said, I've got a set of Bilsteins in a box which look identical, except mine are painted grey. (They are not coilovers by the way - just a normal Macpherson strut). If Nicks are the same as mine, they have an adjustable lower spring platform; though you can't adjust this on the car like you can with coilovers (having a threaded body / seat). My Bilsteins have four groves around the strut body that the lower spring platforms lock into. - You need to have the spring off to change its position. i.e. major pain in the *rse if you want to experiment with different settings.
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