Need visor clips for Shark s600

[oscar-fs]

Hi there all,
I have a Shark s600 helmet that has this push button mechanism for releasing the visor.
Well unfortunately one of these little buttons has fallen out of my visor and gone missing.
I could just buy a new visor but that would set me back £40 quid which is a fair bit when all I need is this little plastic button

Does anyone know of a place where I can get these??
I have found this websitehttps://ridestuff.co.za/8400-shafx16000-shafx16000 but not found somewhere in uk.

Thanks for any help,
Oscar.