We currently have the B737 Single Rudder Pedals made by simujabs in our sim. At the moment we currently have single set, but we are looking into buying another one and link them together.
They are comfortable, high quality and feel great.
Personally, we have had some problems with them, but Pedro at simujabs is helpful and quick at replying. Eg. a sliding potentiometer broke, and we also welded a support bracket under the device.