i did the same thing rowhard was talking about, using the four screws that hold the stock units in place to attach my new unit, my screen i had to do some modding of it since i mounted it upside down... and again like rowhard i had to extend wires, so i ended up only extending the power, illumination, and switched power to the new unit, i made my own ground, and use RCA out of the head unit to an amp to power all the speakers