I have a Polyvance plastic welding kit and have repaired plenty of these cracked panels and a few bumpers.
Take a look at this: https://www.polyvance.com/video/airless-plastic-welding/how-to-secure-a-broken-fog-light-mounting-boss-2
You can use the basic concepts shown with a cheap soldering iron and scrap of similar plastic.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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