thumbwheel

Hi, doe.s any know the part number for dash bulbs i.e vent thumbwheel bulb? w124 1995. I have googled these, but keeps telling me they are 1.2 w. I am sure I read somewhere they are 0.4w.

I've tried searching but not found a definitive answer relating to the W124. Basically the thumb-wheel on my passenger side air vent does not light up like the centre and drivers side do. How do I go about changing the bulb?

My dad has just bought an S 320 cdi - last of the last model The seats have a thumbwheel with 1 - 5 settings on the seat base at the fron. nyoe know what it does ?? Thanks