Help - need driver's side targa panel for 1990 SW20

Hi all,
 
My 1990 original condition SW20 was struck by a falling branch while parked today - ugh!
 
Windscreen badly cracked. Driver's side targa glass panel shattered though the release mechanism intact.
 
My insurer/O'Brien Glass say they can replace the windscreen but unable to source the targa roof panel.
 
Can anyone help? All suggestions welcome. I live in central Sydney.
 
Thanks!