measure openings in outlet eg 48mm
https://www.ebay.co.uk/itm/Motorcycl...-/263870090183
search ebay (check seller feedback etc)(not this one i want 99%+, probably pay a bit more)
drill outlet (measure twice, cut once) probably still need to fettle dbkiller to fit
bolt in (not overtight/drop of medium threadlock), take to MOT....