From another post...

"Yesterday I talked to the dealer if it is possible to make the passenger seat 8 way because the passenger seat has an 8 way switch on it and the wires are present too. He told me it is no problem all what you need are the two extra motors (high up and down and the other one). You can use the original parts form the Mercedes Benz SLK. Maybe we find anybody who make it on his car and write an install instruction for all of us."