TESERY Starlink Full-Width Strip Taillight for Model 3/Y Model:Model 3 2017-2023.10 Built from hard-wearing aluminum with

Built from hard-wearing aluminum with a matte black finish

and how do I know if mine needs replacement

Use your existing fasteners from the old handle — they'll match up at the factory mounting points

Does this bolt directly to my factory cat

Rich Dark Finish - Deep

TESERY Starlink Full-Width Strip Taillight for Model 3/Y Model:Model 3 2017-2023.10 Built from hard-wearing aluminum withStarlink Full Width Strip Taillight For Model3 Y Features Upgrade and optimization based on Tesla's OEM tail light style Excellent Sync with OEM tail light dynamic effects, increase the recognition of vehicle light commands to improve safety. Adopts the through type outlook design, Highly recognizable, express the personality of Tesla enthusiast; adds a sense of technology and fashion Low power consumption, improved brightness, no additional power