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This is right out of the GM service manual so it may be no better than what you already have. It appears the only screws are on the inside and nothing prys off. It may bind in the 1/4 panel when you pull it toward the rear because of the guide pins. Best I can do, hope it helps. Thanks
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the tail lamp screw to 2 N·m (18 lb in).