Theres a place in peakhurst that make the spacers..
I think they are called bsa or something along them lines..
My hubcentric spacers bolt to my studs then have other studs to fit the wheels.
Custom made. Around $160 from memory.
No offence, but spacers are a bad idea. They throw out all suspension specifications and apply a large increase in load to the spindle and bearing that apart from wearing things out quickly can actually lead to failure without warning. Have seen a case on a Nissan drifter that was fatal!
Wheels sitting off standard track look crap and reminds me of mags on the old Kingwood from the 70's.
If you are fitting bigger brakes for the safety then you are foolish to then fit inferior surrounding components. If you want the look only then fit fake plastic covers.
HSV wheels that are fitted to models that come or can be optioned with brake package will clear dual piston sided calipers.
Holden Redline wheels will also clear the Brembo, HSV and other calipers.
Some after market wheels will also clear and dealers seem to know which ones do. Just ask them.
Unfortunately most wheels that clear big calipers are a bit ordinary to look at as they need to be designed with the spokes nearly flat with the rim outer edge to allow the clearance. I looked into every option to try and keep SSV wheels but had to go the Redline wheels in the end. They look OK but not fantastic.