4x100 16's are very rare Ash, or any 4 stud 16's for that matter...
The 4x100 16's that fit VW's and E30 BMW's are RS003's. They use the same centres as the 15's (RS001), just with bigger outer lips and barrels to make up the diameter, they have 30 parameter bolts, the 5 stud 16's like yours have 34 parameter bolts so have bigger centres with 2 more cross spokes. So your outer lips and barrels won't fit a 4 stud centre.
Porsche BBS RS have the bigger centres as well, but with ET50+ so plenty of room for adapters.
I had some 003's, heres a pic so you can see what i mean about the smaller centres,
They sold for $2950 on eBay!!
You could sign up on www.edition38.com and have a look in the classifieds - or try your luck on www.ebay.de most of the germans speak english and if you ask them if they're willing to ship wheels to Australia you might be lucky, they're usually game.
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