A single red 921 bulb for the original third-brake lamp.
Diode Dynamics · Replacement bulbs
The XPR uses LEDs around its metal body for an instant red response through the brake lamp’s red lens. It is sold individually so you can order the quantity your lamp actually uses.
Check your fitment
Use only in a matching replaceable 921 third-brake socket. Diode lists this application on 1997–2026 F-150, including 2021–2023. Check the original bulb and quantity: it does not replace an integrated factory LED lamp, complete housing or cargo-light bulb.
What arrives
One Red 921 XPR bulb.
Plan the installation
LED replacement bulb installation
Check the socket, fitment notes and testing steps before taking the lamp apart.
See the manufacturer walkthrough
The Brightest Self-Contained 921 Bulb on the Market | XPR LED Bulb by Diode Dynamics
Questions before you order
Is the cargo light included?
No. This is the red third-brake bulb, sold individually. Cargo lighting uses a separate white bulb selection.
Does this replace the whole lamp?
No. This is a replacement-bulb product. Keep the original compatible lamp housing.
What warranty applies?
Diode lists a three-year limited warranty for these miniature LED bulbs.
Build the rest of your F-150 lighting
Explore the 2021–2023 F-150 lighting hub · Read the upgrade guide
Product facts and original images: Diode Dynamics. BTS application notes checked October 24, 2026. Manufacturer reference.
