The kit includes our patented - designed in the USA "Smart Signal" super bright red and amber led turn signal lights you can only get from Mustang Project. Fits round and square housings and comes with 4 red modules and two amber LED modules. Also includes Mustang Project's patented precision electronic flasher module so there is nothing else to buy! Enjoy brighter safer, super reliable LED lighting that installs in minutes! For 1157 Lamp socket systems only.