I prefer and use luxury car seat covers here. I have a 2018 350z and I use the luxury seat covers. They fit perfectly and are very durable. I have a dog and they do a great job of protecting my seats from his fur and paws.
According to the TARE weight I have in the January 2010 370 brochure I have it is the following;
1495kgs 6-speed manual - coupe
1510kgs 7-speed tiptronic - coupe
1555kgs 6-speed manual - roadster
1565kgs 7-speed tiptronic - coupe
Nissan 370z weight details here https://weightle.com/nissan-370z