o2 sensors? LS swap

[ClintOBS93]

I am swapping (first time) my 1993 OBS 2WD to a 2001 GMC 6.0 ls with 4l80e. Just wondering what O2 sensors I need to buy for my long tube headers ,,,
upstream? I was only gonna run 2 and maybe I am answering my own question...HAHA.

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