Mine show considerable wear on the back side.
I expect the extra rake of the BA/SM probably contributes to this.
The Triumph schematic doesn't show the part.
A dealer ran it up the pole all the way to Hinkley & word came back "not available".
They are teflon coated.
Don't know if that'll complicate matters or if that's typical.
I haven't measured 'em, but need to.
Does anybody know what they are/where to get 'em?
I saw an outfit in UK that sells 'em by dimension.
Pretty pricey.
I can turn 'em 1/4 turn and run 'em some more, but replacement would be good.