Hi Antti,

Yes the 4x4 callipers are a direct fit with 2wd disks. You will need a 2mm washer between the hub and the calliper but they'll bolt straight up.

As for brands I just went for a STD set from my local motor factors. I've had bad experience with EBC disks cracking so I'd steer clear of those in my experience. On my Astra GSi Turbo I have a set of grooved disks off eBay, non branded. They are noisy but do the job very well.

Lee