The turn signal stalk as used in the Fiero was used way up into the '90s. It was the same length in all the cars. It just had a different profile. Skinny at the bottom. Fat at the bottom. If you have a tilt column, probably the only solution is to tilt it up 1 click.
As for the loose steering wheel, there are a couple of places inside the column that are probably the problem. Screws inside are known to loosen over time. At some time, every Fiero will need these screws tightened.
Both Pat and Scott have been into the columns to do the fixes. Probably others have too, but I'm sure they can tell you what you need to do.
I had to repair my first Fiero back around '94-95. My fix was fairly easy because it was the upper set of screws. After tightening them the first time, they came loose again. Not wanting to LocTite them, I used Elmer's Carpenter's Glue. Believe it, or not, I know where the car is, today, and the steering wheel hasn't come loose, yet.