For the 2000 Ford Mustang, both the low-beam and high-beam headlights use a 9007 bulb. The supplied fitment data does not identify a separate projector or non-projector headlight variation, so confirm the bulb against the vehicle before ordering. Factory fog lights use 899 bulbs.
Notable exterior fitments include 3157A for the front turn signals, parking lights, and front side markers. The rear turn signal differs by configuration: base models use 3157, while the SVT Cobra R uses 3156. Rear brake and tail lights use 3157R, the center stop light uses 906, and reverse lights use 3156. License plate lighting may use 168 or 917.
Interior applications include 578 for the dome and reading lights, 906 for the trunk and engine lights, and 194 or 7441 for map and glove-box lighting. Courtesy and instrument lighting have multiple listed options; compare the original bulb before replacement.