Just need a flo torque hub kit. Will have what is required. Good enough props a few decades ago on heavy boats with big blocks etc. Likely outdated these days. Not sure how well it would suit most things with an alpha on it to be honest. Certainly wouldn’t be for anything with a less than a v8 in it. Even then. Big heavy thing to swing too. But as we all say…there ain’t no rules for props, haha. Always throw you a surprise or shock on occasion