Thanks for that, I've seen 'universal' one with the curve in it...I presume it wouldn't fit yours is why you need to make the cut in this one?
I'll try find the link again...
So the 40mm diameter given is for the lip of the funnel at the bolt end?
30 mm is the inside diam of my Dominator can :
He states 'PLease check your inside measurement before ordering' but doesn't give this measurement in the ad for the baffle?!


[edit]
OK I'm with it now,I think:
The 40mm will go into my 42mm funnel end and the bore needs to be under 30mm.Do you know what it is off hand,at least then I can order?, I've messaged him but possibly wont get a reply till after the bank holiday....