Part number 23372182 refers to the Genuine GM Black Extended View Trailering Tow Mirror Kit. Designed by General Motors, this factory OEM accessory upgrades the rearward field of vision for towing and maneuvering trailers.Trailering Mirrors Black 23372182 / 23372182 - 2019 GMC Sierra 1500 Limited$508.59$6255.0(3)OEMPartsQuick.comDesigned as a dual-mirror upgrade kit to expand field vision, reduce blind spots, and safely manage wide trailers.Key Specifications & FeaturesAdjustments: Features power glass adjustment and manual folding capabilities, alongside a manual pull-out extension feature.Integrated Lighting: Outfitted with red turn signal indicators, amber front-facing clearance lamps, and rearward-facing high-intensity white cargo lamps.Built-in Technology: Built with integrated glass heating elements for frost clearing and a vital passenger-side ambient outside air temperature sensor.Glass Design: Styled with a primary flat upper mirror section combined with a lower convex spotter mirror.Vehicle CompatibilityThe kit officially supports 2015–2019 GM pickup trucks (as well as select late-style 2014 models):Chevrolet Silverado: Compatible with 1500, 1500 LD, 2500 HD, and 3500 HD models.GMC Sierra: Compatible with 1500, 1500 Limited, 2500 HD, and 3500 HD models.Note: This kit is restricted to replacing factory mirrors that lack Side Blind Zone Alert or Lane Change Alert. It will not function on trucks built with manual base mirrors (non-electrical De2/Df2 option codes).Technical Installation RequirementsWiring Upgrades: Complete installation requires purchasing model-specific driver and passenger door wiring harnesses to map the advanced signals. Pre-2015 model variants may also require a 23387133 jumper harness.Dealer Calibration: Activating the high-intensity cargo lighting and clearance lamps requires a Body Control Module (BCM) software flash performed by a dealership technician.Merchant Optionsoempartsonline.com: Available for online purchase at oempartsonline.com for around 521.72USD (Original MSRP: 725.00USD).Chevy Parts Pros: Offered via online order at Chevy Parts Pros for approximately 548.44USD.AutoNation Parts: Listed for home delivery at AutoNation Parts for roughly 578.91USD.If you are planning an upgrade, let me know your exact truck year and model or provide your VIN. I can help you confirm if your truck requires specific jumper wiring harnesses or dealer programming to make the lights function.