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Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
Normally a crossmember would be to do with an engine or transmission in a rear wheel drive vehicle, but in your case I would say it would be an aluminium crash absorption bar behind the bumper bar.
Very common for this component to need replacement, since it is designed to absorb some impact.
Hope this helps.
I hope that makes sense for you John.
All the best.