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License plate lights don't get much attention until one burns out and you're staring down a fix-it ticket. Peterson's M436B-P is a straightforward incandescent replacement built around their patented Vibar socket for a solid electrical connection.
The polycarbonate lens and ABS hood are built to take the weather and vibration that come with trailer duty, and the internal components use stainless steel or tinned brass rather than parts that corrode quickly.
An LED version of this same light is also available if you'd rather skip incandescent bulbs altogether.