The NB Miata (1999-2005) uses a lot of halogen bulbs, now that a lot of them are almost 20+ years old it's a good time to start updating some of the lamp housings and lights.
 
A good place to start are these LED licence plate lamps. They are brighter and more durable than halogen bulbs plus they help modernize the exterior of the car.
 
This is a pair of plug and play license plate lamp housings with a built-in LED circuit, not just a bulb.