Curise control
It is the 3.7 1997 model if that helps?
The controls are mounted on the indicator stalk as you suggested. If your indicator stalk does not have the controls I would suggest two things -
1. It was never fitted (see first sentence)
2. A previous owner has replaced the stalk with a non-cruise one (I don't know if the plugs are the same for cruise/non-cruise for this, but all A4/A6/A8 indicator stalks from this era are compatible).




