I bought this seat for my 1872 rebuild project and I just love it. It has an adjustable back, a lumbar support adjustment, adjustable arm rests, and slide adjusters. It is very comfortable. It is expensive but at my age it is worth it. If you want I will post a picture tomorrow.
https://www.tractorsupply.com/tsc/pr...l?cm_vc=-10005
Here are a couple of pictures of the seat on my tractor.
IMG_20180504_195241.jpg IMG_20180504_195255.jpg