Typically aluminum driveshafts are only offered for manual. They will work on automatics with only very slight modifications. Your shop will do these no worries
the new drive shafts come balanced. so if you switch out the new yoke and put on your old yoke on the new shaft, it might be a good idea to get it re-balanced.
...or maybe it's not neccessary, i'm not sure. but that's something to think about