HI MG,
No, its an upgrade for the 8in. Triumph fullwidth hub that originall had single leading shoe brake,
To the best of my knowledge this hub is the same one that Triumph introduced their own TLS brakeplate for in 67or so
Its fairly common to see the TLS Triumph plate (67 on) fitted to the BSA A10 wheels
I dont have a BSA full width hub to hand to try and see how it would fit to that???
The inner circular boss is too small to fit over the bearing housing on the 8" BSA single sided hub,
Cheers
John O R