Morimoto GMC Sierra HD (07-14) X3B LED Third Brake Light
Morimoto X3B LED Third Brake Light — GMC Sierra HD (2007–2014)
The stock third brake light on the 07–14 Sierra HD is dated, and its cargo light barely reaches the bed. The Morimoto X3B (X3B50) replaces it with modern 3D brake optics plus rail-style white bed lighting that covers the whole box — and it snaps into the factory mounting points and harness with zero modifications.
| Spec | Detail |
|---|---|
| Part | Morimoto X3B LED Third Brake Light (X3B50) |
| Brake optics | Quad 3D optics, polycarbonate, 3W LEDs |
| Bed lighting | Rail-style white bed lights, no dead spots |
| Install | Plug-and-play; existing mounting points and stock harness, no modifications |
| Compliance | DOT and SAE compliant |
| Warranty | 5 years |
| Fitment | GMC Sierra HD (2500/3500) 2007–2014 |
Will this fit my Sierra HD?
Yes — it is made for 2007–2014 GMC Sierra HD trucks and uses the factory third brake light mounting points.
Is it hard to install?
No. Installation is plug-and-play with the stock wire harness and requires no modifications to the truck.
Is it street legal?
Yes — the X3B complies with DOT and SAE regulations for third brake lights.
Does it still light up the bed?
Yes — better than stock. Rail-style white bed lights are designed to eliminate dead spots across the truck bed.
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