Gubi,Vin, I just got the Classic Alfa "stock" front springs today. They are about 12-1/4" free length.
Per CA these would be installed with a 7mm spacer to hit stock Europe ride height, though I've been learning ride height is more art than science so I'm expecting to have to do some iteration on the GTV
If your S4 is like mine and you put a deep pan on the right, 7mm spacer on the right and 14mm on the left makes it pretty dead level.
Thanks for getting back.
I think that my issue, mostly with the rear springs, is "Europe ride height" which I believe is lower than North America.
While the fronts are very close, the rear springs are 30mm (1 1/4" ) shorter from Classic Alfa. This is for S4 with hardtop.
I just have to decide what height I want in the rear.