Make that car behind you see your brake lights!
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.
This 921 is the right bulb for the third brake light on the NA Miatas. It's also the bulb to use in the reverse lights of an NC. Usually, we'd recommend a red LED for this application but we have found that this white one works well. It's good and bright and does not have a pink glow, it's pure red. At 210 lumens, it's brigher than stock.
Sold as single. If you are using them for reverse lights in your NC, you'll need two.
Diode Dynamics HP36