Backup sensor retro kit for pre 2013 CX9's?

[Fredswartz]

The 2013's have the backup sensors as an option. Any word of a dealer retro kit for earlier models?

 

[ceric]

Is the backup sensor well integrated into the screen?
If not, a $50 part from eBay would work as well... beep...beep...beep... I installed it twice on two of my past vehicles.
My CX9 has backup camera, therefore, I skipped this one.

 

[HOLOHOLO]

It's a beeper/buzzer.