Congrats on taking delivery at least.
Firstly, this forum is National so any post you make is viewable by all AROCA AU members and from any of the individual state sites.

The WA club mag is bi-monthly like most with the next one out next week.  So, you would have until end of NOV to send me anything you want.
The forum is a great place to seek out parts as are contacting the various "sponsors" and advertisers.  WA doesnt have an Alfa wreckers as such so the usual suspects - Italian Job, Monza/Alfpa, Turin, Milano Spares, Maranello/Pursang are all worth contacting directly as would be Cilberti, AutoDelta and Auto Italia here in Perth.  You never know what people have lying around. 
The other places are O/S - IAP, Alfaholics and Highwood are worth checking out too.

Alternatively, put a "wanted" ad in the WA mag and / or newsletter (the newsletter comes out in the in between months of the mag) and the WA website itself as the National forum isnt quite as popular in WA as it is over east yet as it is a relatively new tool.
 
If you come to a WA club meeting and join up, i can certainly put you in front of some local members with lots of 105 experience.  Some may offer up gear to borrow as the club doesnt hold this type of assets any longer.

Feel free to contact me directly - edward@selectfs.com.au if you wish to take this discussion "offline".  Having said that, i am sure several "east Coast" members will start reading this post and start offering you advice.

Good luck!