Wanting to use the fog lights might cause a problem with some of the kits because of the high power requirements of the bulbs. I would research the amount of current the bulbs will need and also the max current permissible in the switch to make sure any of the systems chosen can handle them. One of the aftermarket systems that description indicates could work and has some other nice features is the Electro-Tech system.
http://turnswitch.com/Turnsignal.htm Not the cheapest available but the ability to use either their column switch or custom fit your own hidden switch is nice if you don't want to deviate from the stock look. Aside from the possible ability to use the fog lights for front signals, other good features are 4 way emergency flashing and ability to select auto sensing of turns or a fixed time before cancel. The cancel options might be helpful if you are like me and one who is used to modern cars and would forget to manually cancel the signals.
If you go with another setup make sure it is the 6 or 7 wire system that has circuitry to interrupt and direct the brake light signal. On the 3 or 4 wire simpler systems those need a separate rear bulb. To just splice wires in to add turn signals to the dual filament rear bulbs without taking brakes into consideration there will be issues. Because turn and brakes will now use the same bulb filament, instead of having one side flash and the other side be solid when brakes are applied, because the brake light signal goes to both bulbs at once the solid on brake signal would override the turn signal and bulb would never flash when brakes are on and both will flash when brakes are off.
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