Thanks everyone. Getting a lot of choices built up. I may have gotten one set found thanks to a member here. I do still have another Cub I want armrests on, so keep the ideas coming!!
Sam is right, I don't really want to spend over $200 on a seat, but to be honest, I put a new seat on my 1811 back in about 2001/02. Got it from Cub Cadet (even says Cub Cadet in the vinyl) and it made it to 2016, so I guess if I spend $200 on a good one and it lasted at least 10 years that isn't too bad.
I know I gave at least $100 on that Cub Cadet seat 15 years ago.