Speed Triple 1200 Rs Headlight Removal

What size bolts are they?

 

@Richard Cheek Can you not remove the lens and get mould grips or something on the inside.

 

Looks like they might be M5 button head screws? There will be a metal threaded insert embedded into the plastic headlight shell. The torque for these fasteners will be very low and overtightening has caused the insert to rotate. The insert is likely to have a shoulder on the inside so cannot be pulled out. The only way to remove the headlights will be to drill the head off the screw (assuming it does not spin). The remaining part of the screw can then be removed. You then need to figure out how to lock the insert in place to stop it from rotating. The headlight assembly is a sealed unit so there might not be any access to the inside? Might be better to leave well alone until you need to remove the headlights for whatever reason.