You may want to ask Mike at www.AZPinstalls.com
he's pretty good with finding stuff like that, may be he could help.
Most of us in the US don't have any way to get...well I wonder if a older Impressa O2 might work?
178,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here