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Hi John and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, a rather challenging search as this part is no longer readily available and has been discontinued by Panasonic.
Still and subject to availability, would a LINK to a potential Australian online source / seller of the Wireless LAN Adaptor serve your need please?
Alternatively; used, refurbished from another country with likely shipping fees?