Whiteline is one of the best brands available ... I'm not sure if Autobarn sells Whiteline gear (I think they might)
www.whiteline.com.au
The part numbers you will need are;
KSB578A - Front Strut Brace @ $175 Approx
KSB526 - Rear Strut Brace @ $175 Approx
With Whitelines they're the same as a CE Lancer strut brace (I think some Evo's, Mirage, and a few other Lancer models) not sure if this is true for other brands, but I'd assume they'd be the same whichever brand you went for..
You could also try looking into Cusco braces
www.rpw.com.au - Reseller for Whiteline strut braces
as Bennoz mentioned - Unique Auto Sports ..
You could also try calling some FTO wreckers, you might get lucky & find that they have one in stock... see
www.completefto.com for a list of FTO Wreckers, Parts Dealers & workshops in your state.