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The fat and skinny sensors read differently, so you need to match up with whatever your ECU needs was what I can remember over the years.
However for the "fat" sensor, that one reads the same as US model engines, so S14 is a direct swap. Z32 and G20 sensors are technically the same, with just different lengths of harness. People like the Z32 one since the harness is a bit longer and you can move the connector over to the intake side instead of sitting right over the turbo manifold like stock.
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