Buy cap for blackmagic micro cinema camera

Hi,
I have lost the cap for the body of my 1080 micro camera.
Does anyone know where I can buy this and information, or what it would be called or how the size is measured.
I have looked online and can’t seem to find any information nor a supplier of such things.

Thank you.

It's this one: Blackmagic Design Body Cap for Micro Four Thirds

The SKU is BMCASS/LENSCAPMFT.