A word of advice... Don't waste your time and money with the factory switch on the turn signal lever. It's expensive to buy/replace (dealer only item - if I remember correctly) and it is common for them too wear out often, frequently, prematurely, etc. Very poor design!
Just get a toggle switch and keep it simple! I re-wired my factory fog lamps and bought a rocker switch. I then mounted it in one of the blanks underneath the heater controls. Works great!