I installed on on my Hobie Passport a couple months back. Was a super easy install and made a big difference in hull accessibility. Was able to reuse the 8" circular hatch on the bow for forward storage/FF battery. Can't get out to the kayak now to measure for you right now, but when I can I'll get the outer edge dimensions as well as the inside dimensions for you if that helps. Here's some pics of the install:
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