Headlight Bulb Cross-Reference & Interchange Guide: Which Bulbs Are Interchangeable?

There are two kinds of headlight-bulb confusion. The first is “what size do I need?” — that’s a size lookup. The second is trickier: “I know my bulb is a 9006 — so what’s the LED version, what else fits, and is that ‘9012’ listing the same thing?” That’s a cross-reference problem, and it’s where a lot of money gets wasted on bulbs that don’t fit.

This guide is the cross-reference. It decodes the naming systems, shows which bulb numbers are actually interchangeable and which just look alike, explains how to find your LED or OEM equivalent, and walks you through identifying the bulb you already have. It applies to any car, truck, or SUV. For the plain size table, keep the Headlight Bulb Size Reference Chart open in the next tab — the two work together.

The rule that prevents most mistakes. A bulb number describes a base and socket, not a brand or a technology. Same number = same fitment, whether it’s halogen, LED, or a different maker. Different number usually = different socket, even when the bulbs look identical. Cross-reference by the number, never by the shape.

Why one bulb has three names

Before the interchange table makes sense, you need to know that a single bulb often carries several codes from different standards bodies. This is the #1 source of “wait, are these the same?” panic in a product listing.

So when a listing says “9005 / HB3” it is naming one bulb twice — the ECE-world doesn’t use it much, so US bulbs lead with the 9000-series number and add the HB name. Likewise “H4 / 9003 / HB2” is one dual-beam bulb under three labels. Once you see that, half the cross-reference questions answer themselves.

The interchange cheat-sheet

Here’s the part people actually come for: which numbers are the same bulb, which are drop-in compatible, and which just look similar but do not fit each other. Read across your row.

How to read it. The middle column is the useful one: those bulbs will physically seat in the same socket. The right column is the trap — 9005 and 9006 sit side-by-side in the same headlight but are keyed differently, and H4 and H13 are both dual-beam but do not swap. Same-base ≠ approved fitment for your car, so still confirm your exact vehicle before you buy — this table tells you what can fit, your owner’s manual tells you what should.

Finding your LED equivalent (there’s no secret “LED number”)

The single most common cross-reference search is some version of “LED headlight chart” — people expect a table that maps their halogen bulb to a special LED part number. It doesn’t exist, and that’s good news.

The LED equivalent of your bulb is simply an LED bulb sold in the same size code:

• Car uses H11 halogen low beams → buy an H11 LED bulb.
• Car uses 9005 halogen high beams → buy a 9005 LED bulb.
• Car uses H4 dual-beam halogens → buy an H4 (9003) LED bulb.

The number is the base and socket; swapping the light source from halogen to LED doesn’t change it. That’s why quality bulbs are sold as, e.g., “9005/9006 LED” combos — like the featured pair below — they’re covering both sizes your car pairs together, not inventing a new code.

Two things do change when you go LED, and they matter more than any part number:

1. Housing type. A reflector housing is fussy about LED chip geometry and can scatter glare with the wrong bulb; a projector handles LEDs cleanly. Get this right before you get the number right.
2. Anti-flicker. Many cars throw a dashboard bulb-out warning or flicker on LED because the low current draw confuses the CANbus system — a decoder or harness fixes it.

If you’re still deciding between technologies at all, LED vs. HID Headlights settles it, and Color Temperature Explained helps you pick the right white once the fitment is locked.

The HID exception: D-codes don’t cross-reference

Factory HID / xenon bulbs are the one place where “close enough” gets expensive. The D-series — D1S, D1R, D2S, D2R, D3S, D3R, D4S, D4R and a few others — are not interchangeable across numbers, and two details decide fitment:

• The number (1/2/3/4) sets the electrical design. D1 and D3 have the igniter built into the bulb; D2 and D4 rely on an igniter in the ballast. D1/D2 run one chemistry; D3/D4 are mercury-free at a different voltage. Cross these and you can kill a ballast.
• The trailing letter sets the optics. “S” (spotlight) bulbs are for projector housings and have no shield; “R” (reflector) bulbs carry a painted shield for reflector housings.

So a D2S is only ever a D2S. If your car came with HID from the factory, match the full code exactly — and because factory D-code bulbs and ballasts are often far cheaper used, the hid-xenon category plus the OEM HID rail below (eBay Motors) is usually the smart buy. Never try to “upgrade” a halogen socket to a D-code bulb; they’re different worlds. If you want HID-like output from a halogen socket, that’s an LED conversion question, not a cross-reference one.

How to identify the bulb you have

If you don’t yet know your number, you can’t cross-reference anything. Three reliable methods, in order of certainty:

1. Read the base. Pop the bulb out (twist the cap or connector off the back of the housing, unclip the bulb) and read the code molded into the metal base or plastic collar — H11, 9005, D2S, and so on. This is ground truth.
2. Check the owner’s manual. Nearly every manual has a bulb chart in the lighting or maintenance section listing low beam, high beam, fog, and signal sizes. Watch for split fitments — low and high beam are frequently different numbers.
3. Look it up by vehicle. A year/make/model bulb lookup gives you the sizes without touching the car. When it agrees with one of the methods above, you’re certain.

When two sources agree, buy. When they disagree — common on trims that changed mid-year, or cars switched between halogen and HID packages — trust the code physically printed on the bulb over any chart.

Where to buy once you’ve cross-referenced

New bulbs — halogen, LED, or HID upgrades — in every size are an Amazon search away. Start with the featured in-stock bulbs below (they span the common 9005/9006/H11 singles and H4 dual-beam fitments) and the full bulbs and led-headlights categories. Confirm the exact size in the listing, and check current pricing and availability directly on Amazon.

OEM, factory, and hard-to-find bulbs — especially D-code HID capsules, ballasts, and discontinued sizes for older or rare vehicles — are where eBay Motors wins. The rails below search live listings by fitment family so you can match your exact cross-reference.

This cross-reference is a general fitment aid. Bulb availability, wattage limits, and street-legality vary by vehicle and region — always confirm the correct code for your exact year, make, and model, and any DOT/SAE requirements, before buying. See Are LED Headlights Legal? for the compliance side and the Headlight Bulb Size Reference Chart for the size-by-size table.