It's ok, no worries.
Bummer to hear. The other option is try and
custom fit these for mechanical setup.
Yes they list the 17z calipers to use 330mm discs and 18z calipers to use 345mm discs but I'm sure you can use larger discs for either calipers. After some searching this guy
is using 350 mm discs with 17z calipers
I did some more searching and found that the C5 RS6 and B7 RS4 use 8-piston calipers and 365mm discs. So I guess the other option is to try and fit 8-piston calipers for the front and use 365mm discs. Will these fit with 18" wheels?