the lugs are probably made to break like that encase some nob gently backs into you, if the lights were on solid plastic brackets and broke everyone would be moaning that you have to replace the whole light, i have had someone do exactly that, didn't know it had happened till i was washing car and headlight was loose, bought the repair kit, still to fit as i need to pop the bumper off one side but they look like there going to do the job ok.
once there on it will be like a new headlight so don't worry if they have broken lugs etc. it can easily be repaired, still might be a tad expensive though