Instead of buying a new seat, what about a really good seat cushion? I found one on ebay a few years ago for people in wheelchairs that is just amazing. My seat on my tractor is not very comfortable, and after an hour, it became painful. With the cushion, I'm comfortable all day long. It's night and day better!!!!!
I don't rembember the name of it, and I've had people ask me about it, but I don't have any info. I just searched ebay and went with the one that sounded like it was the best. I think I paid around $50 for it.
Eddie