I'm interested in using friction material plates but NOT the more expensive Barnett ones for bultaco.  read on here about using certain Japanese bike plates and it looks like the kit that is sold by Bultaco UK(?) uses that type plate evidenced by much bigger inside dia.  Anyway, all these plates are listed as 110 O.D.  but I'm measuring the Bultaco hub I.D. right at 110.  are the plates slightly under or do they have to be filed down to fit?  I know the tabs are wider but I'm talking about the d