Are they four wire flat or four wire square connectors. Are the connectors from the front and rear o2s the same or are they different. I swapped in an ls into my s10 and repinned the harness so the rear 02s connectors are now my front b1s1 and b2s1 sensors. I am trying to find an 02 with the square connector.

 

Pretty sure they're 4 wire square.

 

all 4 o2 sensors on a 98-02 f-body are identical. When I did my headers, I had to swap in a rear one as my original passenger side one was on its way out.

 

I will assume then they are square and order a set of the vet rears. If anyone can 100 percent verify they are square by morning please chime in. Delphi is not too hot on returns for ordering the wrong ones.

 

The drivers side and passenger side are different lengths