I'd go with Garhauer. They actually make a mounting plate for the mast that is based on the shape of your mast. Same for the boom. You have to send them the mast and boom profiles. Reasonable prices, good solid gear.
As for what to attach it with... you could use either stainless steel/monel pop rivets or screws. A lot of it depends on the mast and boom. Some are too thin to really safely drill and tap.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.