The 2021 Cadillac XT5 uses LED lighting for both the low-beam and high-beam headlights. The fog lights, daytime running lights, parking lights, brake lights, center stop light, tail lights, rear turn signals, rear side markers, dome light, glove box light, trunk light, and general interior lighting are also listed as LED.
For the replaceable exterior bulbs, the front turn signals use 7440A, the reverse lights use 921, the front side markers use 194, and the license plate lights use 2825. Interior bulb fitments include DE3021 for the map lights and 6612F for the vanity lights.
This fitment data does not list separate bulb sizes or variations for different headlight types or trim configurations. Verify the existing socket and connector before ordering, especially when replacing an LED-equipped lamp.