Hi glock17
I replaced one of the rear plastic number plate screws which had sheared off. Luckily there was just enough of the screw protruding to cut a slot in and use a screwdriver. Not sure if it is a fault with the plastic screws but they were very tight to screw in, even after cleaning the threads out with a tap and applying a little teflon grease.
As the other guys have said, there are definitely no nuts on the back of the panel
Cheers Spike