1999 chevy s10 2.2L

The wire to the upstream hos2 sensor was cut off and I can’t find the other end to it. I found another wire that seemed to have been cut off in the same fashion, but of different size.The piece still in the sensor is thin and bright purple, the other i found is thicker and a dull/faded purple they both have white/silver copper, not the regular bronze color copper normally used.
What I need help with, is to know where its coming from and what is it called so that I may be able to buy it .
I thank you in advance for all your help.