I have a 2010 rav4 sport. I now have audio steering controls!!! I purchased the OEM part called the SWITCH ASSY STEERING, Price: $189.43 usd, from toyotapartsbarn.com. It comes with the controls on the left and the same display section on the right. Both have to be installed together, so your old display part is not needed anymore.
I brought the part to my Toyota dealer (in Pointe-Claire, quebec) and they installed it, for (get this) $38.00 , it took them 20 minutes. I am soooooo happy :D