So, the seats would do the back and forth on whatever MB tracks they adapted to, but all other movement functions are controlled by the seats themselves?
Yes. If is like my seats they only have two wires to supply seat power. Ground and 12V.
Yes. That's how they work. Keep in mind that there is some minimal track tilt on the stock seat tracks on all models, except for passenger early models. The early model driver tilt is often unknown, and virtually non-existent. In either case, the forward and back slide will be just like stock, and whatever seat track tilt is currently there will also be the same. All the features of these seats are above the part you sit on.
- power seat back tilt. There's a rocker switch for this.
- manual flip forward latches to allow rear seat entry, just like stock SL seats.
- air filled lumbar chambers that are filled with a power pump that is powered by a push button switch. It fills all three air chambers to the max.
- there are three blue buttons to release air from the three different height horizontal air chambers to achieve the desired lumbar.
- there is a switch for the power heat.
- there is one knob on each side of the seat back to adjust the width of each back side / torso bolster.
- there is one knob to adjust the upper back/shoulder tilt, which I just call "slouch". The headrests moves forward and back along with this.
- the headrest goes up and down, and also tilt forward and back, just like stock seat headrests.
- there is a lower leg extension that extends the length of the bottom portion of the seat.
I believe that wraps up all the functions of these seats.