I'll try to find one that was recommended in the Facebook Clarity group. In the meantime someone highly recommended this. {shrug} Seems odd, but he really likes it!

https://i.imgur.com/lRUr1AM.jpg

Someone said by using these they found they did not need lumbar support. My legs are long enough that I don't think they'd fit between these and the steering wheel.

https://www.costco.com/type-s-gel-seat-cushion-with-comfort-gel-technology-2-pack.product.100681310.html

I bought one of these for my wife's office chair and she says the same. NEW not used.

https://smile.amazon.com/gp/product/B08HN6XK5B/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

There are a lot of good ideas here:

https://smile.amazon.com/s?k=Original+McKenzie+Lumbar+Roll&i=garden&ref=nb_sb_noss