gu3 wheel arch flares

hi all - my right rear flare has fallen off... it's left the plastic plugs in the door and snapped in a couple of places where the plugs slot into the moulding of the flare itself.

Two questions - how the hell do you get the white plugs out of the door without destroying them?? if at all... and how do you put the thing back on??

I have some plastic glue to "weld" the plug receivers back into place, but is there any traps for young players on the refit? had a good look around the forum, but can't find anything specific...

cheers