The DB killer is a fit-all baffle that is manufactured in different sizes to fit different tailpipe diameters, I've got one for my Scorpion can. If you want something a bit more in keeping with that cracking bike and you can't find a genuine baffle, might be worth having a look at MHP exhausts - they do tuneable baffles for different noise limits, you just add extra an part or adjust it to make the zorst quieter. http://www.mhpexhausts.com/exhaust/baffles.php#
Isn't the whole in the Stage 3 silencer an odd shape meaning standard baffles will not fit ? I need to buy one for mine some time soon. Thinking I will just have to bite the bullet and pay cira £50 for the OEM one !!!