Temperature sensor

[david151]

I went to change the temperature sensor today (I also changed the thermostat) on a Mazda 323 1997 1.5l hatchback. the reason being is that the temperature gauge is almost constantly reading zero. I removed what I think is the sensor from the location shown with the red arrow:

http://imageshack.us/photo/my-images/201/sensorloc...

When I took this out water leaked from here so I presume this is the correct thing? Anyway the problem is I ordered another sensor from GSF and when it arrived it is only 2 pin and looks slightly different from the one removed. Please see the following pictures:

http://imageshack.us/photo/my-images/52/21888854.j...
http://imageshack.us/photo/my-images/14/63968144.j...

As you can see the original black sensor is only 2 pin and the new green one 3 pin. Also the endings look slightly different and although the thread is the same pitch the old thread looks slightly longer. I then phoned GSF to enquire about this and they said the only thing showing for my vehicle was a 2 pin and not a 3 pin. As such I am really confused. I would be grateful if someone could look at the pictures and tell me if the part I removed from the engine is the correct thing or is it a GSF mistake?

Many thanks