Morimoto GMC Sierra (14-18) X3B LED Third Brake Light
Morimoto X3B LED Third Brake Light — GMC Sierra (2014–2018)
The X3B upgrades the 14–18 Sierra's third brake light with modern 3D brake optics and real bed illumination in one piano-black housing. Quad red optics driven by 3W LEDs keep you visible day and night, rail-style clear optics light the bed evenly, and it all installs on the original mounting points with the existing harness.
| Spec | Detail |
|---|---|
| Brake optics | Quad 3D optics, optical-grade red polycarbonate, 3W LEDs |
| Housing | Piano-black polycarbonate |
| Bed lighting | Rail-style clear optics, even light with no dark spots |
| Install | Original mounting points, existing wire harness, no modifications |
| Optional | F1-style rapid flash module (sold separately) |
| Compliance | DOT and SAE compliant |
| Warranty | 5 years |
| Fitment | GMC Sierra 2014–2018 |
Is it hard to install?
No — it uses the original mounting points and connects to the existing wire harness, with no modifications required.
Is it street legal?
Yes — the assembly complies with DOT and SAE regulations.
Does it still light up the bed?
Yes — rail-style clear optics provide even lighting across the truck bed without dark spots.
Can I add a rapid-flash function?
Yes — an optional F1-style rapid flash module is available separately for added visual impact.
Complete your GMC Sierra build
More parts that fit your GMC Sierra and pair well with this one — matched and ready to install.
$239.00
$348.00
$539.00
$613.00
$159.00
More for your GMC Sierra
Pulled from the 268 products that fit your GMC Sierra — so every item here is guaranteed to fit. No sorting through parts that don’t.
Specifications
Multi-column
Join Our Community
For all things NVMOS, check us out on Instagram and Facebook!
Financing Available
Buy now and pay later with Affirm.
Contact Us
Have a question? Just send us an e-mail at support@nvmos.com
