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MAF? I don't believe Neons use a MAF. They use a MAP, which goes on the left side of the intake manifold.
This. Having changed a radiator on a Neon before, I can't think of what part (sensor, especially) you took off that you'd be asking about? The sensors are all attached to different parts. All I recall doing was loosening hoses and the PCM mounting bracket.
It's square, has green rubber type gasket in middle . On opposite side of where gasket is, there is a place where a 3 wired connector should connect to. Also has 4 screw holes.