The knock sensor is interchangeable with a bunch of Nissan models between 91-2002. There's very few model specific sensors. Grab the Hitachi KNS0001 sensor and you'll be good to go. I like rock auto, but you can search your favorite online vendor for it.
Much easier to just remove in the intake manifold. If you have bendy arms, you might be able to get to it from the bottom.
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