Either orange or special (chrome) coated bulbs. The special-coated one only lights orange when you use the indicator (usually used with transparent lenses).
Single = 1 piece
These universal auxiliary lights with energy-saving LED...
Bulb 12V 60/55W P43T T16X75 C-8/C-8 H4 UVS HD HIGHLIFE, H4...
This powerful street-legal headlight bulb delivers up to...