[Compatible Bulb Models] These bulbs are compatible with various bulb models, including 7443, 7443A, 7443LL, 7443NA, 7443SRCK, 7444, 7444NA, 7444LL, W21W, and T20. They serve as an upgrade for multiple functions such as front/rear turn signal lights, tail lights, brake lights bulbs, side marker lights, corner lights and blinker lights, providing a brighter mode and enhanced performance.