Exhausts for mk1 cabby with 20vt conversion.

Hi all. Can someone point me in the direction of an off the shelf exhaust system for a cabriolet (1990 plate ) with a 20vt conversion please.

Several palces do one for a tin top. But not cabrio.

I also understand there is a conversion piece that can be bought to get the 3" down pipe to fit to the standard system. But would rather the full system if possible
.

Thanks.