Brake disks are 312mm, 8N0 615 301 A
Adapters, none. for Ibiza FR and Cupra, the calipers and disk are plug and play. only that you need is a 5mm spacers with Ibiza FR 17" oem wheels
H&R Spacers of course ;)
Brembo kits for 6Ls ibizas, part number is 6L06071450, it´s the same that...