I'm interested in your brake upgrade too.
have you any part number applied on calipers, discs and especially on ADAPTERS?!
as i see kit part number is 1P0071450, as on SEAT accessories list.
it's very intresting, because on photo calipers similar to Leon 1M Cupra R (LCR) (Brembo Family C) with outer balance pipe, but brembo propose 1A4.6008A which have Brembo GT Junior calipers (Brembo Family A) as autops.co.uk/product.asp?productid=311145
Discs on that kits may be identicaly 323x28, but offset between center of calipers mounting holes and centerline of disk (calipers offset) is differ on 5 mm. So, as i understand, kits must have different adapters or spacers.