https://www.amazon.com/OrientalMusicSanctuary-Professional-ALL-Paulownia-Travel-Guzheng/dp/B06XHYLYMV/ref=sr_1_3_sspa?keywords=Koto&qid=1647914367&s=musical-instruments&sr=1-3-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFQQkpQTFJQMFFSN1cmZW5jcnlwdGVkSWQ9QTA1ODgzMjQzTEhUQUtMQzFETDFYJmVuY3J5cHRlZEFkSWQ9QTA2NTU1MDgySDhJTVFaT1hLTDQ4JndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
I found this. I dunno if it's the same like you want it to though.