Bulb types · Signal / marker
WT21W bulb
Catalog code WT21W — appears in 2 model-year × position rows. Confirm against your owner’s manual before swapping.
CodeWT21W
FamilySignal / marker
Fitment rows2
Top positions1
Replacement options
Halogen, LED, and HID picks for WT21W. Prices and availability come from Amazon — confirm fitment for your vehicle before buying.
Halogen
FAXCARS WT21/7W WT21W/7W OEM Standard Halogen Replacement...
$10.69
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Halogen
FAXCARS WT21/7W Halogen Bulbs 12V OEM Standard Replacemen...
$10.68
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LED
Alla Lighting WT21W LED Bulbs, Super Bright Rear Turn Sig...
$24.99
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Halogen
FAXCARS WT21W Back Up Light Reverse Lamp Bulbs 12V 21W OE...
$12.99
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Halogen
KRAVTEKNO 4 Pack WT21W Halogen Bulbs 12V 21W Clear Glass ...
$18.99
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LED
LASFIT T3 WT21W LED Bulb Backup Reverse Light WT21 WT21W/...
$54.99
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Halogen
FAXCARS WT21/7W OEM Standerd Halogen Bulb 12V WT21W/7W Re...
$39.99
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Halogen
RUNEWAX WT21W/7W WT21/7W Halogen Bulbs OEM 12V 21W Standa...
$10.98
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Halogen
WT21W Bulb 12V 21W Fit for Turn Signal Reverse Lights, Du...
$14.99
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LED
Alla Lighting WT21W/7W WT21/7W LED Bulbs, Super Bright Re...
$24.99
Details →
Where WT21W shows up
Ranked by how often this code is tied to a lighting position across model years — a practical clue for dual-beam vs single-beam and fog vs headlamp confusion.
| Position | Fitments |
|---|---|
| Back Up Reverse Light Bulb | 2 |
Makes that use WT21W most
Based on catalog fitment density — not a claim that every trim uses this bulb.
- Ford2