Thanks for reaching out!
The good news is that most of the bike seats available on REI.com will fit on your bike. The bike seat that works best for you is going to depend on a lot of factors, including, but not limited to, how long you ride, whether you wear cycling shorts (with a chamois), and your sit bone size (width). We recommend reading this Expert Advice article, How to Choose a Bike Seat, which contains a lot of really good information on the topic.
Hopefully this helps, thanks!