Where can I source a clip like this?

[Mickhead]

Circlip or e clip wont do it?

[PeeBee]

Circlip or e clip wont do it?

Unfortunately the arm and shaft dont have a groove as such, its working on a sort of spring loaded lock-on I think. I have not lost one yet, so they obviously work as designed, just trying to find out what they are and where I can buy. Nissannewby and others have some alternate mounting or securing options. which I think are both possible if I cant find the clip.