Concerning your wood dash, if you are handy or have a friend who does wood working it's not too difficult in cutting out the hole for the switch. I cut a hole to add an interior temperature display and it worked out very good. If you buy the wood dash piece from a car graveyard, take a piece from your car to assure the color and grain matches, the color can vary greatly. When I check I'll see if there is a system for your car and let you know.
Lebenz, do you know if these cars are prewired for the heated seats?
Also tried the site and got,
"Sorry illegal reference to Our Domain"
figure that one out?
500E sway bars
210 16in wheels