paragon1970 wrote:
Mentions 5/16 can work on the following link so 1/4in (6mm) should work:
https://www.mariner-sails.com/hobie-shackle-5-16in-pin-mast-tang.htmlHeres how to use it:

So that particular diagram would be for the old single holed mast tang, not the mast tangs with 3 holes in it. Also, if I were still using the single holed mast tang, I would only use a 5/16th's shackle for safety as theres a very large load on that single hole and shackle.
Ultimately, I was hoping to get away with just using a shackle from my local West Marine but ended up driving to the nearest Hobie dealer to grab the proper, shorter 1/4" shackle for the upper holes on the mast tang. Already had the 5/16ths lower shackle. The 1/4" from the Hobie dealer fit perfect and now I have everything properly rigged! Safety safety safety
Thanks everyone.