XS2 Front Disc Brake - what fails ?

[gggGary]

 

[Grewth]

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Thanks Gary
I was going to ask about the axle lengths.
I've definitely got a spare '70 -'71 type axle, and a '73.
Not sure if I've got an XS2 axle, BUT, the upside is that the XS2 was actually sold in the UK back in the day.
Actually we got it for three years in a row, and completely missed out on the TX650 and TX650A, finally jumping to the XS650B in '75.
So theoretically, there should be more XS2 parts lying around on breakers shelves.