YEEEES darn that was hard but I think I found the partnumber for your dear bike holder!
Here is an install-manual:
http://www.toyota-tech.eu/aimupload...SABH bracket PZ408-Z0690-00 AIM 002 013-0.pdf
If I understand the manual right, the partnumber should be PZ408-Z0690-00
Not sure if that is a complete set or not, but at least you can show the manual to the dealer and ask them to fix the price and all for you!?
Hope this helps!
EDIT: Now im confused.. here is one more, hehe perhaps some one can clear this out, this is a start at least
http://www.toyota-tech.eu/aimupload...00692-00 and PZ408-00693-00 AIM 002 012-1.pdf
EDIT 2: I think that partnumber ZWA10T32027 is the partnumber for the complete set. The fist manual is for the holder and the second is for electrical. Got this list:
Bikeholder "Freeride": ZWA10T32025
Bikeholder "Luxury": ZWA10T32026
Bikeholder "Barracuda" (Right): ZWA10T32022
Bikeholder "Barracuda" (Left): ZWA10T32024
Bikeholder "Easy Click" including lights: ZWA10T32027