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last I heard you could get a plug from NAPA, it was a car part number but it worked. Look in the ECM section might find it there, but yes there is one.
I just went to my local Indy shop and asked for O2 port plugs, ya might want to ask them if they can put my anti-seize goo on 'em for ya before installing. I just did mine the other day had to use a long extension on the ratchet and an allen socket to tighten the rear plug but I no longer have the sensor wires to deal with.