They are obsolete now. You'll just have to scour ebay or the for sale thread, and then mortgage your house to be able to afford it.
Im afraid that Stealthy is correct, your best bet is to look high and low through ebay. Remember some people are computer illiterate and place things in the wring area where potential buyer can't find it!
rare spares....expect to pay $98.00 +,there is some seller on e-bay, that has geniune obselete stock,but once again expect to pay $98.00+
breeze through these pages... http://cars.search.ebay.com.au/vn_H...1QQftrtZ1QQftrvZ1QQga10244Z10425QQsacatZ32056
http://cgi.ebay.com.au/VN-COMMODORE...yZ102357QQssPageNameZWDVWQQrdZ1QQcmdZViewItem 4 days left and no bidders as yet....you can always ask seller if he/she will sell outside of ebay,a lot do,if you ask,just message them
http://cgi.ebay.com.au/COMMODORE-VN...yZ102357QQrdZ1QQssPageNameZWD1VQQcmdZViewItem also give this crowd a ring,they have heaps of VN stuff,he may have one laying around..