Installing 2018+ S550 Mustang Headlights on a 2015-17 

I don’t because it was a direct plug in. The only thing that required rewiring was the turn signals.

It depends on how much the 15-17 costs you and if you can find parts already painted. All the parts that I used for the conversion cost about $2500. It was a combination of Used and New. Paint cost me about another $2500. So, if you can find parts that match your car, you're looking at $2-3K.

You would need todo the full conversion for the headlights. The 15-17 headlights will not fit with the 18-23 fenders, hood, bumper, and core support.

@@JDubWrenching okay great cause I want to do like a 10 speed gt500 build and I don’t like how the new lights look on the gt500 bumper so I want to put the old lights then the bumper and ofc supercharger

You would have to convert the front to the 2015-17 for the lights to fit.

oh wow! would that mean converting the bumper only or hood as well? @@JDubWrenching

The only thing that I had to buy for the front to make it work was the upper core support, headlights, and bumper. Everything that mounts to them is the same.

@@JDubWrenching does the headlights for the 2018’s connect with the same plugs as the 15-17s plug for the headlights and fog lights??

@@HEMIQUINZEL no they do not. You either need to cut and splice or re-pin for the 18+.