would recommend electrexworld ignitions
, run on my red frame 400 and 400 falta simple to fit either twin plug (stk 952) or single plug (stk 950) ignitions.
you will need to purchase the electrexworld puller for these ignitions, as the thread is different on the cz flywheel.
best service out of the uk parts sent by courier.
web site electrexworld.co.uk
petard