I'm about to buy some lowering springs for my '88 535i and I was gonna go for eibach but I thought before i do so i'd better ask you guys for your opinion. I want a drop of around 40mm at the front and the same or a bit less at the back. In everyone's experience, which are the best to go for (value for money)? Bear in mind the car's on 17's with 235's. Also where can i get hold of some hubcentric rings? Thanks guys.