Try CAD direct, they nearly always have them in stock.
Personnell Licensing Office
CAD Flight Standards and Airworthiness Division
Room 911, 9th Floor Commercial Building
Airport Freight Forwarding Centre
2 Chun Wan Road
HK Internartional Airport
Hong Kong
Tel 2769 8653
[email protected]
Lunch hour 12.45 to 13.45, closes 16.45