An easy and affordable route to significantly increase visibility toward other motorists. These direct replacements for stock incandescent bulbs produce intense light output, with additional benefits of low current draw, longer lifespan and resistance to prolonged vibration. Direct replacement for stock incandescent bulbs. 1156, 1157 and 3157 style bulbs cover all common turn signal and taillight applications. White/Amber 1157 is great for front turn signal applications: high-intensity white running light, amber on-off flash when turn signal is activated. 1156 Bulb dimensions: Overall length is 1-3/4" x 1/2" diameter. 1157 Bulb dimensions: Overall length is 1-3/4" x 1/2" diameter. 3157 Bulb dimensions: Overall length is 2-1/8" x 1/2" diameter.