Nissan OEM Part Number for Lambda Sensor required please.

I need to replace the lambda sensor on my 1999 Almera N15 1.6 SLX automatic 98bhp .
Apparently there are two alternatives, one is "450mm" and the other "185mm". I have no idea what these lengths refer to , possibly length of sensor but as it is in the car !!??
Supplier says if they know OEM part number they can cross reference.
So, can anyone give me the part number please ?

Thanks

Brian.
 
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