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NA cars have cats on the headers and on the mid pipes. ROW cars just have cats on the mid pipes. all cars require o2 sensors before the cats (for air/fuel mixing) and after (for emmissions). NA cars do this on the header cats, ROW cars do this on the mid-pipe cats. a quick check of the PET will show you the locations. in all cases (NA, ROW, air/fuel, emmissions) the sensors are the same (and are the same as the standard bosch o2 sensor of the era - mike folke has the data on his website); the only difference is length of wire. also, in 2003 they changed the connector. so, you can try to find oem with the proper length of wire, splice your current sensor longer, or get jeneric with pigtails and make your own.
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