When doing replacement or upgrading on the 2018 Toyota 4Runner, the bulb size guide is necessary for you to take the reference.

(Click the bulb sizes to check Boslla lighting bulb)

Low Beam Headlight H11
High Beam Headlight 9005
Front Fog Light H11
Back Up Light 921
Daytime Running Light 9005
Dome Light DE3175
Front Side Marker 168
Front Turn Signal 7443
License Plate 168
Parking Light 7444
Rear Turn Signal 7440
Luggage Compartment DE3175
Interior Door 168
Map Light 168

You can check the bulb sizes with the vehicle make/model/year in the following link:
https://auto.boslla.com/

Boslla Bullet B4 4 Color LED Headlight Bulb on Toyota 4Runner. Give you a different experience of being able to switch the color of your headlights.