If you put both together you have a set of Rear LED, Passengers side is a bit expensive.
http://www.ebay.co.uk/itm/NISSAN-350Z-2008-PASSENGER-REAR-LED-TAIL-LIGHT-03-09-/370850312932?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item565866b2e4
http://www.ebay.co.uk/itm/2006-NISSAN-350Z-2DR-CONVERTIBLE-O-S-OFFSIDE-RIGHT-REAR-LED-TAILLIGHT-TAIL-LIGHT-/271233126903?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3f26c111f7