2G Help Identifying an O2 sensor.

[88BB8B]

Can you guys tell me what kind of O2 sensor this is? Namely if it is a narrowband or wideband. It's a Denso, and it has the numbers 5550 12G20. I looked it up on their website, but it didnt yield any rults.
Heres some pictures.

 

[dustyboner]

at first glance i'd say its a 2g rear O2 sensor.
what does the plug look like?