I have some matt black 17" TD Dezent Alloy Wheels 112 x 5, 7.5J x 18 ET40 (with plastic spigot rings) - also required conical bolts. They are a no-nonsense, easy to clean design.
I have not fitted to the
Cupra yet, but these squeezed over the 340mm VAG PP brake set up on the Octavia VRS. Must have low profile balance weights fitted though, with only a few mm clearance - these were a TUV approved size for the VRS, but with the ET40 offset would not have allowed fitment of the snow chains. I think that an ET48 version is now available that will provide a similar fit to OEM - I purchased mine when the first MQB platform cars were rolling off the production lines, so choice was limited.