I need some new earsocks for my Crosshair 2.0, does anyone know where these can be got or if any other earsocks will fit for Crosshair 2.0?

I'd say try calling Customer service

Unfortunately there are no other earsocks which fit into them.
A replacement kit for the crosshair 2.0 was available a few months ago (unfortunately only for a very short time): perhaps you can find a O Store or Vault who still have it or some online reseller....