Just seen this on a facebook site . It may be useful to some folk. OK they come from China but have no more info than that.
Honda XBR500-GB500 Monoclub
tSp1dnonsoreehd ·
Well, my lad is bodging a Honda cg125 together. He bought an exhaust clamp and collett kit from china. £5 interestingly the clolletts are same radius and length as my xbr collets. They would need trimming to height but as they are mild steel no problem. Oh and you get 4! 2 of different heights .