For the 2019 GMC Yukon XL, the low-beam bulb depends on the factory headlight type. Models with halogen headlights use an H11 low beam, while models with HID headlights use a D3S low beam. Confirm the headlight configuration before ordering, since these bulbs are not interchangeable.
The high-beam application is a 9005 bulb. This listing does not provide a fog-light or front turn-signal bulb fitment for this model year.
Other listed bulbs include a 921 for the reverse lights, a 2825 for the license-plate lights, and a 6612F for the vanity light. Check the existing bulb and vehicle configuration when replacing these applications, particularly if the vehicle has equipment variations.