Which O2 sensor with threaded downpipe

So I just picked up my 90 alltrac and it came with a downpipe with a threaded bung instead of the 2 bolt flange. Does anybody know a part number for one that works?

I don't have a part# to suggest, but all narrow band O2 sensors work the same way. The only difference is the connector and sometimes the wire colors. Some have heaters in them so they warm up faster and these will have four wires instead of two.

So, if you are willing to do some wire splicing and already have suitable connectors then you should be able to find something that works.

Not sure of the part number but the Caldina 215 motors have the threaded one. I have one that is used if you want it. I am putting a TD06 20G on right now and the downpipe has the 2 bolt style opening welded on it already.

1st gen Tundra V8 one works.
The O2 sensor, not the A:F sensor.