Two types of specifications are used for the Box by the SUP board manufacturer:

US Box & US Surf Box

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1) US Box (Windsurf spec)

Here's some brands who are using it: STARBOARD, NAISH, JP-AUSTRALIA, FANATIC, QUATRO, F-ONE, BIC SPORT, MISTRAL, RRD
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2) US Surf Box (Surf spec)

Here's some brands who are using it: SIC, 404, ANCHOR PADDLEBOARS, INFINITY, IMAGINE, KINGS PADDLEBOARDS, BARK, LOKAHI, GLIDE, BOGA, RIVIERA, HOBIE, LAHUI KAI, SURFTECH, JIMMIE LEWIS, RED PADDLE Co.
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Please contact us if you are unsure about the USBox specification and the fitting for your board