Searching for 60/50 springs

[Memphys™]

Is there any spring manifacture that produse suspencion springs for e30 with 60/50 lowering cause i couldn't found any with

[lowlightbw]

lowtec

[Memphys™]

I just found in this online catalog http://www.dtsshop.de 3 makes of the spring that i'm looking for: DTS (60/50), AP Racing (60/50) & Weitec (60/60)
My idea is to make my E30 coupe good enough for the roads and for making some fun (drifts, donuts...), have you got any impression of theese makes of springs and can u reccomend me some schockabsorbers too.
It has to become nearly that lower in the front and the rear:
(hope the owner of the car don't mind using his car for example)