The Panther

I just purchased an R3 Rage, but the supplied screws and D rings are too small for the pre-drilled holes in my helmet. I found the right size screws, but those are too large to fit through the holes in the D rings. The only other rings I could find are the ones to hang pictures. Does anyone know where I can get D rings that will fit and be strong enough? My other option is to drill out the hole in the ones I already have.

The ones supplied are M5 and the ones I have to use are M6.