An SWF switch is what you need. They are almost identical to the 240 series (81 on) and will fit the centre console, by widening the hole by 1 mm.
I got mine from Keith Wallington of Fry's Spares:
http://www.frysspares.com - you can choose the coloured insert, the pictogram on it etc too. If you need a copy of the SWF full catalog, I have a copy of one somewhere on my computer, or some Googling will get one for you.
Paul
Rob wroteI am after one of the big rocker switches that will fit in one of the blank panels in the centre of the dash of my 164.
I don't care what it is currently used for or what colour it is (unless i have a choice) but it must be a 3 position switch and must hold in all 3 positions, a momentary switch is no good to me.