I bought 12V. bulbs at
https://www.superbrightleds.com for my vintage trailer. Not because of brightness, but I wanted less amperage draw. (not sure I will for my truck though) With LEDs, make sure you get the same color as the lens it will be going behind. Red for your tail lights, Amber if behind amber lens, etc. Below are the part #s I bought.
67-A15: Amber marker light
67-R15: Red marker light
1157-R24-WV: 1157 Red 100 Degree tail light
amperage draw below:
LED Incandescent
tail 0.01 0.52
turn 0.07 1.86
both 0.07 2.31
marker 0.07 0.52
