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I noticed one of my tabs was broken when I took my bumper off I used a panel bond from 3m I had to fuse it back together. If you still have the tabs get some type of plastic welb and you should be fine.
the question is which tab is broken? if it's the top tab i believe you'd be able to replace it since it's the only removable tab held by two screws.. IMO that's the most important tab securing the headlamp so as long as you have 2 of 3 tabs just leave it as is ..