Give your Miata interior an upgrade.
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 29mm bulb is a straight replacement for the interior light bulbs in 1990-95 Miatas - as well as thousands of other applications around the industry. It's a quality upgrade, too. It's brigher than stock, but has a frosted housing so it has a nice diffuse look behind the lenses. The eight chips make for nice omnidirectional lighting so you don't have to aim your bulbs. You have the choice of cool white (6000K) or warm white (3000K) coloring - cool white looks like an LED, warm white looks more like an incandescent. 130 lumens means your interior will be nice and bright. Given how few lights are in the interior, this is a great upgrade.
Sold individually. You'll need one for every light you want to upgrade.
Diode Dynamics HP6
We also offer 31mm bulbs for other applications. You can fit a 31mm bulb in the 1990-95 dash lights but it's difficult.