I see this post was made last summer but I'll still comment just in case anyone else is reading.
The Older wakeboards not only used a different thread, but they also have a different spread on the mounting holes. Older model wakeboards used an 8 inch spread, and the current wakeboards use a 6 inch spread.
So there is a generation of wakeboards with 8 inch spread and imperial threads, a generation of board switch 6 inch spreads and imperial threads, and the current generation of boards with 6 inch spreads and Metric threads. It's not easy if you're a collector or trying to save money by buying discounted (Older) gear, but you can usually find what you need on Craigslist or other online selling websites.
Good luck!
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