Don't know where to go for this info, so came here:
Can I direct substitute a 1156R LED with a filament type 1156 bulb? Some sources speak to a resistor between the bulb socket and the LED. But, I'm wondering if the resistor is built into the 1156R LED, since it obviously plugs into the same socket the 1156 filament type bulb does.
Where's a good place to find an inexpensive socket for the 1156 bulbs?