I too fitted my own starter button during my 125 build.
Button came from Farnell, its made by ITW code 76-9410/439088R, and is exactly the same as that fitted by cc but half the price (£9 against £18).Link here
Wiring is ready behind the dash with connectors already on, sitting just to left of steering column. Two wires, one red, the other white and red.
Took 10 minutes to drill the dash and connect it up !
As for QR go for the Rapfix system, better than the CC offering, written up in last months Low Flying .
Edited by - sevenmad on 3 Nov 2010 21:37:02