Hi wondered if I can get some advice, My 350slk has the tip tronic side to side on the shifter which I never really use. But to get the spec I wanted I had to take a car with the not my bag part wood wheel. I have found a replacement leather unit that has no centre(airbag,horn,readout controls etc) but it also has the paddle gear change. What else would be required to get the paddles and all the controls working? Is there already wiring for the paddles and controls?