This is for 1 pair of Purple bulbs part number 1157!!This is a direct replacement, no modifications are necessary!These bulbs will work in any 1157 Applications like: This is for a pair of bulbs (2 bulbs will be included) Backup bulbsTurn Signal LightsParking LightsInterior LightsAnywhere you can put an 1157 dual filament bulb!!These bulbs carry a full 1 year, no questions asked warranty