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If a marker, tail, or brake light on your rig is running on the original incandescent 1156 bulb, an LED swap is one of the easiest upgrades you can make. This two-pack uses the single-contact tail-style base so it drops straight into the same 12-volt sockets your factory bulbs came from.
Keep a spare pack in the rig — LED bulbs are a rare failure, but it's nice to never be caught with a dark marker light at a night check stop.