In researching a reply to lilbit's question about the check engine light (lite) for his Lincoln Town Car I found some potential cheaper US sources for new and rebuilt compressors for Oz Fairlanes, LTDs and Fairmonts. Even after freight and duty these should be massively cheaper than your Ford Australia parts counter price (around Au$1,000). See http://www.strutmasters.com/lincoln/towncar.htm,
http://www.arnottindustries.com/part_Ford_Expedition_pid37_yid3.html, and
http://www.suspension-alternatives.com/Lincoln-Mark-VII-Air-Suspension-System.html
http://www.arnottindustries.com/part_Ford_Expedition_pid37_yid3.html, and
http://www.suspension-alternatives.com/Lincoln-Mark-VII-Air-Suspension-System.html