I couldn't get a blanking plug for the O2 sensor connector for my 1000. The ones for other Suzukis don't appear to fit so I disconnected the O2 sensor, blanked the wires/plug off and cable tied them out of harms way. If you do this you'll then need to disconnect the appropriate ECU pin to stop a fault message coming up of on the dash.
There appear to be at least two wiring layouts used on the later 32 bit ECU that uses two plugs (one small and one large).The sheet from Dynojet says to disconnect pin 17 with the black with brown tracer. This did not tally with my bike (2007 DL1000) at all. It didn’t even have a black/brown wire at all. After much rummaging on the internet and speaking with a Dynojet installer it turned out that I needed to disconnect pin 11, the black with white tracer in the small ECU plug, which did the trick. Whether this is correct for you bike I cannot guarantee.
You don't need to cut this ECU O2 wire (when you've successfully located it!). There is a removable front cover surrounding the ECU pins on the small plug. Remove it and using a very small screwdriver you can press the little tangs on the pin and then push it out and tape it up securely. You can the easily put it back at some future date if needed.
Hope this helps.