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Marker and clearance lights matter for visibility on the road, and swapping incandescent bulbs for LEDs cuts down on the bulb failures that come with vibration over time. The 161R is built as a direct LED upgrade for rigs currently running 154-series lights.
It operates across a 9-16 volt range for flexibility across different electrical systems, and the kit includes the 154-11K mounting bracket with terminal pad, so it's ready to wire in without sourcing extra hardware.
A straightforward swap for anyone looking to move older clearance lights over to LED.