Fulcrum Racing Zero help required

I have a pair of two year old Fulcrum Racing Zeros, they are great wheels and I have no complaints.

I was descending this evening, and ran over a branch as I was coming out of a corner, this lovely item punctured both my front and rear tyres, as I was holding it together and slowing to a stop both tyres deflated completely and the tubes and tyres seemed to shift about due to the braking. As they shifted, the valves seem to have pushed out the little plastic valve hole grommets, and they are gone.

Anyone know where these little inserts/grommets can be bought as replacements!

Thanks