I've got a 2010 and have a set of after market 17s I'm looking to install. EBay has a ton of after market sensors but I'd much prefer OEM. Also any recommendation on where I should buy something like this?
Your best bet is contacting your local Toyota dealership, and asking the parts guy the part number. I know they would be happy to help you.
http://parts.camelbacktoyota.com/parts/2010/Toyota/Prius/Base?siteid=214329&vehicleid=208868&diagram=8546190&diagramCallOut=1