91 Taurus bumper unglued?

Anyone know what the hard plastic bumpers are made of, and/or how they're attached to their mounting brackets? Momsy's Taurus wagon's rear bumper
has come loose from the side bracket (looks like it got scuffed by someone in a parking lot, flexed enough to break the join), and is flapping in the breeze. Were they sonic/heat-welded, epoxied, solvent-cemented, Krazy-glued, Scotch-taped, or held on with little pink Bandaids with hearts and flowers?
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