Axle shaft broke 8 3/4

Ya it's running a 741 case with open 3.55 gears.
I bought a 742 case that has 4.56 gears and I'm going to install them along with a new axle shaft.
I just don't know where I'm going to get a new axle shaft.
I have a spare axle shaft sitting in my storage unit but it's got the passenger side adjuster nut on it.
Does it matter which side the axle shaft goes in? Or can I remove the old bearing and adjustment nut from my spare axle shaft and put a new bearing on it and then put it in on the drivers side?