I made some extensions for a portable SLC Free WBO2 tester (see posts here Tail Pipe Sniffer - #6 by sganz ) and I found cable and connectors on Amazon to make them. I think I have about 10+ feet of cable for each. I only did minor testing and from what I saw there was no difference with a short or longer cable.
This is the female connector I picked up off of amazon - Amazon.com: CADUFUELLY Sensor Connector Kit for Engine Wiring Harnesses, Replacement for 4.9 LSU Wideband O2 Sensors : Automotive
I was working with my own connectors on the other end, not sure what you need on your side, but I would imaging you could find them on Amazon as well. Just make sure it’s the right gender.
HTH
Sandy