You will prob have trouble getting a link pipe with 3 bolt flange. Don't think they made the GK76 with a bolt on can. Are you trying to fit the srad can to it? You could try an early Fireblade linkpipe or CBR400 link. But both will prob need 'adjustment'.
Maybe try Carbon can company, or one of the bespoke exhaust system makers that advertise in MCN.
Ade