what are the actual terms for the 2 sensors on the 96-98 obd2a cats?

i have a 98' b18c1 and i need a new rear o2 sensor, i know this is pricey but can you guys verify for me this will plug in the rear o2 hole in the cat?
*i'm asking due to i'm confused if rywire is selling this for the front sensor or the rear o2 for the cat. (i don't know the actual terms for the wires, so that's why i'm asking)

http://www.rywire.com/catalog/wire-o...dd2845b0cc25e9

thanks in advance.

 

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