Give your NC nice bright front turn indicators!
We use LEDs from Diode Dynamics because they're the best ones we've found. They're made in the US to high standards, not just the minimum price. They've got constant-current circuitry to protect the bulbs from transients and offer a three year warranty.
The 7443 is the correct bulb for the front turn indicators on a 2009-15 (NC2/NC3) Miata - as well as thousands of other applications around the industry.
The switchback option is cool. It's white for the low wattage light, but amber for the high wattage. This gives a nice clean look most of the time but there's no mistaking your turn indicators for anything else. And with a 410 lumen output rating, nobody will miss you.
Sold in pairs. Note that you will need a resistor to avoid hyperflash with these bulbs.
410 lumen switchback: Diode Dynamics HP24