Having swapped the seats in other cars, I can't think of any intrinsic reasons why it shouldn't be straightforward.
That said, you need to keep the following in mind:
- Is the replacement seat significantly larger or smaller, especially width wise?
- You will likely need to fabricate a track adapter to fit the existing seat mounting points, as the bolt heights and positions you have will be different from what, say, a Ford seat wants.
- Be ready to wire a switched and fused electrical supply to each seat, ideally with a separate switch for each.
- If you're planning to get a heated and ventilated seat, check the electrical demands of the new seats to make sure they're close to the same as the Nissan seats. If they're higher, you might need to rewire that too.
- Do you have seat position memory? If so, you'll lose that functionality.
All of that said, this sounds like a useful improvement. I'd assume you're looking at Ford donor seats, especially given your experience. I'd avoid GM, as their high end seats are actually cooled, versus ventilated, with a circulated cooling fluid in the seats. From a functionality standpoint, they're superior, but far more complex. Do have a look at ventilated seats from a Saab 9-5. They're about the most comfortable seats I've ever sat in, the leather is nice, the heaters are world class, and, given Saab's demise, decent Saabs are sitting in junkyards simply because values crashed when the company went under, making insurers quick to,total even decent examples.
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