Usually most stereos wire up the same. Sometime the factory stereos can have some interesting wiring setups from the factory. Most europian cars won't pass emmisions because of a aftermarket stereo being installed (ECU throws out a error code). Well I daigress.
Speakers should be color coded in pairs - color, color-black (ex.violet, violet-black). Only 3 wires you should worry about are the power wires, red(ignition) , yellow(memory or battery constant), and black(ground). I usually get the red and yellow mixed up in what they are for but it won't harm the stereo if you mixed those 2 up, just switch them back.