I searched and didn't find an answer, though maybe I'm just not using the right terms. I just dug into the o2 sensors last night and found that they're in a little plate that bolts onto the header, and not a screw in like I'm accustomed to. Is there a plate that has threads in it so I would be able to screw in a o2 sensor and then bolt it to the header?

 

Headers like the MVP/Xerd don't have that same mounting provision, they just screw in. I thought I remembered reading that there were o2 sensors where they would screw out of that plate and be able to screw into a header like that...I'm looking for just that plate to put a wideband into it.

 

In case anybody else searches for this somewhere down the road, I picked up a "flanged Toyota o2 sensor bung" off EBay for $9, looked to be exactly what I was looking for.

 

Another thing I was thinking is that I have a wide band with a 5 volt output I was wondering if I could just remove the stock O2s and replace them with a wideband signal?

 

You can, read up in your wideband's instructions about it.

 

where did you pick up the sensors? is it one kind for both up and downstream? (i.e. with flange)