[GuidoK]

But the question is, will they fit?
For the bottom half of the h&r spring the OP can fit for himself as the h&r spring has to fit into the stock bmw rubber spring pad (my guess is that the H&R spring will have a larger lower diameter than that the spring pad has).
For the top half of the H&R spring it has to fit that KW adjuster. I dont know if the diameter of that adjuster is the same as that stock spring pad the h&r spring sits in.
Of course he can buy a fitting kw or bc spring, but theres a chance that that doesnt match well with the front setup if thats much stiffer or much softer than the kw/bc setup

Actually the H&R springs look a bit like kw springs but fitted upside down. (where kw has the softer coils on the bottom and the stiffer coils on top and with H&R its the other way around)