Nope they should fit fine. I have a set of OEM VW Classix which are 17x7.5" ET54 and I'm on Eibach 30mm (front) 40mm (rear) drop.
They will be inset a lot into the arches so a pair of 10mm spacers would bring them out nicely at the rear. Just for looks though, they should fit ok as is.
HTH
Not that I'm doubting you Sandy, as you have had them in your hands, but are the Classix wheels definitely ET54? I was under the impression they were ET51 the same as the GTi.....
Thats what I thought Lee,, until I bought them and inspected them. Unless the 4 was really just a squigly 1?
Will go and inspect mine tonight, they're still in the garage as I've still got my 16" winters on.