If he can send it surface mail, go for it!

I'd love to get a parts catalog in printed form, but they seem to be extremely rare to find in US at least. The Japanese catalogs are available every month on Yahoo Auctions, so I have one of those.

All the AU parts that are the same may use the same numbers as used in US, but all the RHD parts (wiring harness, etc) will definitely be different. The Japan and US part numbers do match for shared components like emblems and such.

Here's Australia Post. 4.5 kg Parcel to USA looks to be about $50 AUD, which is about $37 USD. Plus the seller might ask a handling fee of reasonable amount ...