Anyone know if these are interchangable? Same with the little harness that goes to the headlight switch too?

 

if you are talking about the turn signals in the front bumper they are totally different. the headlight harnesses are also different.

 

true...you need the s4 bumper, amber cover lense, actual light assembly which would include the pigtail...never heard s5 to s4...usually people want to upgrade from s4 to s5.

 

Yeah I know... Just that I got an S4 Signal and it's harness. Guess I'll just rewire.

 

the lenses don't fit.

S4 lights are taller/not as wide.

S5 lights are not as tall/wider.

 

wait... I'm talking about the switch and harness

 

No! The switch and harness are wired different and mount different. You would need an entire S5 Gauge surround to mount the switch and to re-wire the harness to make it compatible with a S4 dash harness

 

I have the S5 stuff. I wanted to mount the S4 switches and it's harness to the S5 Main harness but I got the answer from Ice.
One last question... what if I rewired accordingly? Other than that I guess I'll get the right stuff... thanx everyone who posted.