The wheel caps are available on ebay, but they need some modification.
This is the deal for about $27 on ebay delivered:
Seller is very quick to post them and they arrive in good nick.
a link to them is here:
https://www.ebay.com.au/itm/4-Car-A...44?pt=LH_DefaultDomain_15&hash=item4d17eb6418
The reason they have to be modified is that the lugs on the back are so long that they cap won't sit flush against the Audi wheel. BUT: if you cut them just long enough they will sit flush but not clip in place.
SOLUTION:
First cut the lugs at the point where they taper, retaining one of the raised hemispheres on each lug. The lug on the right has been cut.
Then, get a couple of joiners for 40 mm plumbing pipe. They are the exact size to insert partially into an SF Forester hub. (I don't know about other models).
The joiners look like this:
For the SF forester, I cut them at 16 mm, and used a mitre saw to make sure the cuts were square.
Then glue the pipe to the back of the cap. Obviously you need to rough up the surface with a dremel or such to get the glue to bind. I used a 2 part epoxy liquid steel type glue, mainly because it dries quickly and works well.
When gluing, the metal ring inside the cap works as a guide to make sure the cap is centered on the pipe.
These caps fit VERY snugly, so you need to account for variations in temperature in the hub, otherwise the caps will pop off. I dealt with this by cutting notches that corresponded with the lugs, to allow a tight fit, and drilling holes next to the lugs to allow expanded air to escape.
Go for a drive before you fit them, and fit them when the wheel and hub is warm. Let it cool, go for another drive and check them all: you might have to give them a shove to re-seat them, but they should then be fine. I have offroaded with mine and had no problems.
In my opinion, they look great and are very functional. My partner says they look like something that you would pay Subaru a lot of money for. I think sh'es right.
They also perfectly match my metallic blue paint!
