Wico's don't switch via the actuator- while 8-ways and 4-ways do have different size actuators, the base is also different: on a 4-way you get a diamond shaped hole instead of the round one on an 8-way.
If you find a 4-way with the wrong color handle, Ponyboy has a good deal on nice new black handles. They come with 8-way actuators, though.