Id be searching online for overseas suppliers since finding stuff local can be a bit of epic facepalm!
Nengun sell Project Mu replacement piston kits for OEM calipers.. i bet its cheaper than buying genuine Subaru!
Quote:
UGP-S204
Subaru - Impreza - GC8/GDA/GDB not Brembo - Rear 2 Pot
Imprezza - GC8/GF8 Ver1-2
Imprezza - GC8/GF8 Ver3-4
Imprezza - GC8/GF8 Ver5-6
Imprezza - GDB
Imprezza - GDA
AU $ 213.26
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Link here:
http://www.nengun.com/project-mu/upgrade-piston-kit