been offered some 19" rs4 alloys and just wondered if they fit my tqs?
depends on the stud pattern, if they are 5x112, then yes they will. Whether they look any good is down to opinion. I had some on my S4 when I bought it, but I think 19s look too big on a B5 unless it's a RS4, so I sold them and got some 18s instead.
If they're actual RS4 wheels (rather than replicas in the RS4 style), then i doubt they'll fit very well as they're very wide and have a low offset.