1) The outer parts are the same as a 25 or 27 as found on pretty much any 46-73 CJ. So closed knuckle spindles are closed knuckle spindles. Any of the usual suspects should have them. Like these guys http://www.kaiserwillys.com/product/...ts-accessories
2) The closed knuckle 44 wasn't as strong as the open knuckle. But if you change the spindle-to-knuckle bolts to cap studs like the open knuckles had, they are pretty close to as strong. No really easy way to do high steer on closed knuckle.
If you decide not to use either of these axles, I'd be interested in the brakes.