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i got mine for $15.00 from a gut in Renton. it works great, he makes them himself. there is a BIG BBQ this Sunday in Auburn, probably about 35 WRXers will be there. his name is 03UURX, check out the thread and hook up with him.
I found this thread at NASIOC and am currently using this fix. It cost only $5, or $10 if you want to make 2. This is a mechanical (non-electronic) CEL fix that only requires you to drill a 1/2" hole through one piece so that the O2 sensor won't bottom out.
The following is the Help! part# 42002 from Motormite. This will need to be modified by drilling through one so that the O2 sensor won't bottom out. With both pieces screwed together, the length is around 2". These are the 18mm tapered part, but there is also a 18mm flat mount style part# 42009. These can be purchased from any autoparts house, like Kragen, Pepboys, etc. Any place that carries the 'Help!' Motormite brand.
I actually bought both parts, then drilled a 1/2" hole through each #42002, then used the #42009 as the base, now I have 2 mechanical O2 bung fixes. Enjoy!