I got my A4 B6 done by European Autotech quite a few years ago. They actually swapped out the entire roof 'panel', instead of fixing the sagging.. Do...
Completed Build Project: A4 B5 Quattro 110 Kw 1.8T AEB 1996
Current Project: A4 Quattro 132 Kw 1.8T B5 2001
Daily Driver: A3 1.8T 1999
A couple more A4 B5 Basket Cases, I'm repairing and will offer up for sale.