RRC exhaust question

Has anybody got a classic Rangey with an exhaust system like a disco? where the centre box is seperate from the tailpipe and front pipe? I ask this as we have a customer who needs a new tailpipe, but says its not the one on Microcat that is the centre box already attached to the tailpipe Yet that is the only exhaust system listed on Microcat for the Tdi RRC 92-94 or will a disco tailpipe be the same? only without the centre box attached?

I really hope someone understands this as i know i'm not the best at explaining things

Cheers in advance tho

Steve