For the 2018 RAM 2500, the high-beam headlight uses a 9005 bulb. Low-beam fitment depends on the headlight design: trucks with projector-type headlights use 9005, while models without projector-type headlights use H11. Check the headlamp housing before ordering to confirm which configuration your truck has.
Projector-equipped models use LED lighting for the front turn signal, parking light, and front side marker. Their rear tail light, rear turn signal, rear side marker, and brake light are also listed as LED. Non-projector models instead use 3157A for the front turn signal, parking light, and front side marker; 3157R for the tail light; 3057 for the rear turn signal; 3057A for the rear side marker; and 3057R for the brake light.
- Center stop light: 921
- Reverse light: 7440 with projectors or 921 without
- License plate and glove box: 194 or 7441
- Map light: 578