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The inside trim around the rear window on a 78-82?
Remove one side of the interior "halo" trim and then kinda rotate it out.
It may be stuck with windshield adhesive, should just pull loose.
Almost all these pieces have velcro fasteners on the back sides. A gentle tug should loosen it them up once you have the trim screws out.
Do you have the assembly instruction manual (AIM)? The AIM often shows about where the velcro fasteners are since those on the body were installed on the assembly line.