Latest guides
Practical notes from the Guides section.
- Halogen Headlight Bulbs ExplainedLearn how halogen headlights work, compare them with LED and HID options, and decide whether standard halogen is enough for your vehicle.
- Types of Car Light Bulbs ExplainedLearn the differences between halogen, LED, HID, incandescent, and sealed-beam car bulbs, plus practical checks for safe replacement.
- 1156 vs. 1157 Bulbs: Single-Contact vs. Dual-ContactLearn the difference between 1156 and 1157 bulbs, including contacts, filaments, socket fit, vehicle checks, and LED replacement tips.
- 7440 vs. 7443 Bulbs: Choose the Correct Wedge BulbCompare 7440 vs. 7443 bulbs, learn the filament and socket differences, and check the correct wedge bulb before replacing it.
- 3157 vs. 4157 Bulbs: Interchangeability and Fitment GuideCompare 3157 and 4157 bulbs, including fitment, base design, terminal layout, color, wattage, and practical interchangeability checks.
What this site is for
Look up bulb positions, cross-references, and year-by-year fitment without guessing from a parts-counter printout.
Vehicle fitment
Make → model → year → positions and bulb codes from the Autotk catalog.
Bulb types
H11, 9005, 9012 and the rest — fitment counts, positions, and cross-reference notes from the catalog.
Guides
Practical swap notes: halogen vs LED, legality caveats, and common mistakes.