need quick help to find oxygen sensor

[mariann]

i need the oxygen sensor (the one after the catalitic converter)
i have 1.3L 2007 yaris hatchback.
in ebay all sensors are to 1.5L engine.
when i ask will it fit to my 1.3 engine they say they dont know and i'm on my own.
few reffer me to check if the part number is match to what i need but they dont say where i can find the 1.3L part number. i have googled it and couldent fine.
i have found one that looks almost the same and even the correct wire colors. they say its for 2007 yaris 1.5L and when i ask them if it will fit my yaris 2007 1.3L they say that they cannot gurantee it.
the retail price here is almost 300$ !!!
need your help guys.