There's this:

https://www.amazon.com/dp/B09PG6ZP68?psc=1&ref=ppx_yo2_dt_b_product_details

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It has cushion and lumbar support and looks solid. I put it in my 2022 Frontier and it fits.

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If someone knows covers that are good without cushions as well I'd be interested in them.

Regards,

:)