Right then...!! Nick and Dave where do I start!
I bought the calipers with carriers which were custom made apparently, I went to AMD when it was still AMD and they said they were Seat Leon (? don't quote me on that it was a long time ago) carriers iirc but with a bit machined off. Thats the bit i needed!
Basically the surface of the carrier which bolted to the upright had been machined flat and there should have been two lugs on there of about
3mm each.
When I fitted them initially I spaced them off of the upright to get the right offset for the S3 discs with 6 washers 3 at each bolting point, and yes they were normal S3 discs 312mm. I had the idea that I would run them like this, not an ideal solution, until I had the time to turn myself some proper spacers up to fit between the carrier and the upright, I never got to this point!... After not long at all the washers compressed as I thought they would and the 2 lugs on the inside of the caliper in the recess where the pads sit started to score the discs, not badly to start with but constantly. I checked them and decided that I couldn't run them like this and took them off and replaced the whole set up with the Brembo set up as I got a deal on them through work.
No radial spacing was needed at all with my carriers. Just offset.
I'm not sure about ibiza carriers, never seen a pair tbh but 7mm does sound severe but if thats the difference between the offsets then so be it! Tbh if radial spacing is needed to get the carriers to fit scrap them, get a set that needs some adjustment to offset and it is a lot easier, or no adjustment at all would be even better!