Where can I get a new visor clip for a Phantom XV helmet?

Over the weekend I managed to snap the clip on the side of my Phantom XV helmet which is used to attach the visor to the helmet, I have had a look on the main stores for replacement clips but haven't managed to find any, does anyone know where you can get these?

The clip is attached to the helmet by allen key bolts so looks like they should be replaceable.

Helmet side clip: picture