sorry, never did a write up,
Local junkyard, about $65 for the steering Bezel with switch no blank for it, backup module (mounted RR Qtr next to PDU), and a rear tail light harness. Since the yards have a tendency to get happy with the wire cutters rather than pull them apart the one i got didn't have the sensor side and it didn't have a bumper it was already sold with the cut connector. I did check once with the stealership for the harness, it was over $100. I only needed a bumper at this point but all the yards where cleaned out at the time, so i put the project on the back burner. Fast forward a year and the Ex was rear ended in a chain reaction, minor damage to the hatch and took out the bumper Insurance paid for a used bumper and i was able to score everything else and fix the bumper on top of it. For $200 it came with cover, foam insert, sensors and luckily the cut connector which i was able to splice together with the rest of the harness i got. Finally got it all plugged in and to my amazement it worked.
In the pic (module is not there but), bottom right corner is a black box, this the rear PDU, next to it is are the plug for the Fuel pump, RR tail light, Trailer wiring and the Parking sensors,
Parking sensors are a stand alone unit.