Paul, there is no such car as an Audi 80 5 cylinder, as thats the point of the Audi 90
You need a set of Girling 54 type calipers
A set of carriers from either of 3 cars pictured in my previous post (B2 Audi 90 petrol, B2 Audi coupe GT5, B2 Passat GL5) = 1984 -1985
and a set of 256 discs from a 1991 Golf GTI 16v.