Yes, The box is standard on all SUP's. It is called a fins unlimited box and they became standard on surfboards in the late 60's. Prior to that there was a lot of diferent box systems that didnt crossover. The flex fins are a great idea for shallow areas but performance wise choosing the perfect fin is a matter of trial and error. There are many fin manufacturers and hundreds of handmade fins that you can try in your box.
The Kayak Wing
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