If you’re still looking, Amisco’s Triana is one candidate that matches the arms + upholstered back + swivel requirements. The manufacturer lists a welded steel frame, a 300 lb capacity and a 360-degree swivel without a return mechanism: https://www.amisco.com/en_us/wtrianastool

Before ordering four, I’d check the arm height against the underside of your counter and allow room for the arms to swing without hitting the neighboring stool. Also confirm whether you need counter height or true bar height—they’re easy to mix up. What’s your counter height and approximate budget per stool?