I just bought an early TA22, 1972
need another ignition barrel cause the guy has bypassed it cos it shat itself.... anyway I have heard that the later ones, with the little white button on top, are apparently different and wont fit...
Brendon,
I'd be surprised if you couldn't get the later style to fit. You might just have to drill a hole in the plastic cover for the button, thats the only difference I know about.