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Part number for front O2 sensor?

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I see mention that there's a sticky with part numbers on this forum, but I opened all the stickies and I can't find mention of the part I need. Sorry in advance.


Anyway, it's an '07 Legacy Limited 2.5i. Need the part number for the front O2 sensor. Some sites say Denso 234-9120, and some sites say Denso 234-9123. Which one?



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305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD).  CHECK your oil, these cars use it.


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