Adding audio control on steering wheel LX470?

[Wilsil]

In Australia forum members on LCOOL has added audio controls to their steering wheel, but that was on LC100, not on LX470.
Does someone has the knowledge here if it is the same for an early 2002 LX470?
Has someone done it?
The next question would be, has someone a spare audio control laying in the shed/garage unused?

 

[Get outside]

If it was me I would just add one of the Parrots Bluetooth controls to the wheel and pair it with the stereo and phone!
Check it out. Search for Parrot Bluetooth.