As best I can tell it would be the #92-0688-2807.
My thoughts are that it would be cheaper to do something like this for the time being as opposed to swapping in an Expo axle and then a locker for it. That way I can run the 28-spline until it blows up and then go big time.
BTW What's the real difference between the no-slip and lock-right? I can't seem to find much on their differences, other then the no-slip is a newer design, quieter, and has more parts. lol