In my previous job I used to do optical design for tail lamps. I don't think you should directly replacement of the light bulb with LEDs, because the light intensity profile of a bulb is very different from an LED. The reflector of the tail lamp is designed for bulbs such that tail lamp's intensity profile meets FMVSS 108 (NHTSA's law that governs lighting). Changing the bulb to LEDs guarantees your tail lamps fail specs.
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