Thanks for the part #'s. Do you know if that is an actual O ring? In my research I discovered someone who had been shipped an actual O ring because it was a replacement for the older cylindrical seal. I would like to post pictures, but I don't want to pull my intercooler and IACV to remove them.
I've made contact with a member of the forum JDMvip who resides in NZ who has offered to source and ship the parts from Subaru. Thanks for the time and support.

**Edit: Here is a link showing the original seal which actually corresponds to the part number you gave me. Not sure if Subaru Australia would still have access to the original part.

http://forums.nasioc.com/forums/show....php?t=1925510