I have searched everywhere and found nothing

Could someone help me in finding what Boush O2 sensor will work for the Zeitronix WB. I am looking to replacing it but really do not care to order it from Zeitronix and wait on it. Is this something I could just goto a local parts store and get?
I recall reading somewhere that the sensor was used from a VW model vehicle but that was several years back.
Someone please help.....