Silverado Bulb Size Guide: What Fits Every Light, By Generation

“What size bulb does my Silverado take?” sounds like it should have one answer. It doesn’t — and the reason trips up a lot of owners standing in the parts aisle. Chevy ran the Silverado across four generations spanning 25+ years, changed headlight designs at every one, and offered halogen, HID, and LED headlamps within the same model year depending on trim. A base Work Truck and a loaded High Country of the same year can take completely different bulbs — or, in the LED case, no replaceable bulb at all.

This page is the reference: every exterior light position, the bulb size by generation, and — most important — how to make sure the number actually matches your truck before you buy. Because lighting parts are cheap and the lighting category is easy to shop, the expensive mistake here isn’t money, it’s buying the wrong bulb twice.

Read this first: trim beats year

Before any chart, one rule that overrides everything below:

Confirm whether your headlamp is halogen, HID, or factory LED. A bulb size only applies to a housing that takes a replaceable bulb. Factory HID and LED headlamps — common on LT, LTZ, LTZ Z71 and High Country trims, and standard on most 2019+ trucks — are sealed assemblies. There is no “H11 upgrade” for them; you replace the whole unit.

How to tell, cold and off:

• Halogen — you can see a clear, glass-look bulb behind the lens; a twist-lock bulb pulls out from the back.
• HID (xenon) — a small bowl-shaped projector lens up front, bluish-white when lit, with a slight warm-up delay.
• Factory LED — rows or clusters of small emitters, instant-on, no single replaceable bulb.

Base WT trims are the safe bet for halogen. Everything fancier is where you check.

Bulb size chart by generation

These are the most common halogen-trim bulb sizes for the Silverado 1500. HD (2500/3500) trucks track closely but occasionally differ on fog and marker lamps. Sizes are widely cross-referenced, but treat this as your starting point and verify against your owner’s manual or an in-store bulb finder for your exact year and trim.

A few things worth calling out:

• The 2007 “Classic.” In 2007 both bodies were sold side by side — GM’s own production history confirms the outgoing GMT800 continued as the “Classic” alongside the redesigned GMT900 for that full model year (see the Chevrolet Silverado generation timeline on Wikipedia). The 2007 Classic is a GMT800 — use the GMT800 column. The “New Body Style” 2007 is a GMT900. Same year, different truck; this is the most common bulb-lookup mistake on a Silverado.
• High beam barely moved. The 9005 high beam runs from 1999 all the way through the halogen T1XX trucks — one of the few Silverado parts that’s nearly generation-proof.
• The low-beam switch. GMT800 used the 9006; from GMT900 onward halogen trucks moved to the H11. If you’re cross-shopping an older parts list, that’s the number that changed.
• Fog bulb aliases. The 5202 is sold under a pile of names — H16, 9009, 2504, PS19W/PSX24W-adjacent packaging. They’re the same socket; buy on the 5202 number and ignore the marketing. If your fogs don’t work at all, or your truck was built with blank filler panels instead of fog lamps, the fog light & cab marker guide covers the circuit, the retrofit parts list, and cab clearance lamps.
• “NA” means amber. A 3157NA (or amber-coated turn bulb) gives the correct amber signal color behind a clear lens. A plain 3157 there looks wrong and can draw attention on a lens that expects amber.
• The rear is its own project. Tail and third-brake-light circuits fail differently than headlights — corroded sockets, cracked lenses, and the notorious cab-leaking high-mount stop lamp. The tail light & third brake light guide covers rear replacement, the CHMSL leak fix, and LED conversion without hyper-flash.

Going LED without getting it wrong

Any position that uses a replaceable halogen bulb can be converted to LED — the LED just has to match the socket (an H11 LED for an H11 low beam, a 921 LED for reverse, and so on). Two honest cautions:

1. Headlights are about beam pattern, not brightness. A quality LED built for your reflector or projector throws a clean cutoff; a cheap one scatters glare and leaves you with less usable road. If your factory housings are yellowed or hazed, a full assembly usually beats a bulb swap — the full decision is in our LED headlight guide.
2. Interior and signal LEDs can trigger hyper-flash or errors. Turn-signal LEDs may flash fast without a resistor or a compatible flasher; some dash-lit bulbs need a canbus-friendly version. Match the bulb to the job.

For the exterior LED accent and light-bar side of things, the lighting category and our LED headlight guide cover what’s worth adding.

How to buy the right part

• New LED bulbs, conversion kits and accent lighting: Amazon Automotive — browse the lighting category.
• OEM headlight assemblies, factory HID/LED headlamps, and fog housings: this is eBay Motors territory. Used and OEM take-off assemblies are the real marketplace for a trim that never took a replaceable bulb, and for restoring a truck to factory optics. Use the search buttons above — the assembly search for a clean OEM unit, the fog search for a housing swap, and the LED-kit search if you’re converting a halogen truck.

If your truck’s a K2XX and the peeling isn’t the lights but the dash buttons, or you’re chasing a lighting fault that’s really a common generational issue, those guides pick up where this one leaves off. And if you’re not sure which generation you’ve got in the first place, start at the generations & fitment reference — everything on this page keys off it.