Broken Sagaris number plate light

[M4RTIN J]

Changed the bulb in one of the rear number plate lights and the clear plastic housing is broken. Just held together with the rubber seal that sits round it. It was only held in with one screw, when I've tried the remaining screw in the other side it doesn't appear to screw in to anything.

Two questions, where do I get a replacement light housing and missing screw? Should there be some kind of captured nut the other side of the fibre glass that the screw screws it to? If not is there a clever fix or just a need for bigger screws?

[M4RTIN J]

Thanks both, part ordered and can close the old hole with resin for the replacement self tapping screws. Should all be here for the weekend!