I fitted Eibach ARB's 2 months ago,and I had the same question with gobbleplease about the front brackets.
The answer is that you should use the OEM brackets,by ''opening'' them so that the new ARB sits in.
Then you use the OEM bolts and everything is fixed ok.
Personally I use Bilstein (custom setup 55mm)shocks,Eibach Sportlines and Eibach ARB's.
With soft-F,hard-R settings, the car is almost neutral on good asphalt.
On the track I'd prefer a harder rear ARB,so I will buy a BSH 27mm arb soon
I just bought TT front lower arms and WALK,so that I fit them all together.
When everything is done,I will open a topic of ''my ride''.