Hi David,
If you go here:
https://www.ebay.com.au/sch/i.html?_...+caps&_sacat=0
You might see something suitable.
Car parts retailers like Repco, Supercheap etc may have trims too in 16 inch size. If you are tempted by something get them to demonstrate they fit properly before you commit to buy.
Attached are a couple of picks of OEM trims for guidance.
Good Luck. BTW Google is your friend.
Cheers