I haven't used any of the Gruppe-S bars, but I'd imagine that the fitment should be fine at this point. Rarely do you hear about any manufacturers having fitment problems anymore. I think you'll be happy with the sizes you picked.
Don't know if you saw my post about the gruppe-s sway bars but Sinister said to ask you. Gruppe-s has for sale on their site their own sway bars for $115. I was wondering if you had any experiance with these or knew some one that has used them. I was just looking at the rear bar. After reading your swaybar sticky I decided to go with whiteline 24mm front sways and an adjustable 22mm rear. Thanks for your time.