What part are you referring to as a bowl? The part between the shroud and the lock housing?
The lock cylinder is attached by a single screw.
Looking at these pictures (from a current eBay listing), which parts are broken? I can look them up in my parts book and let you know what the part numbers are and what vehicles those parts came in. I suspect S10, late 70s F body, and perhaps Monza and Chevy pickups may share the same parts. Nova may be different.
I added an exploded view of a similar column for a Monza (H body). my parts book doesn't have one specific to the A body. The A body and H body columns are of a similar design, so should be able to reference it to identify the parts you need to replace. The part numbers for the Monza may not be the same, so don't look up those parts. Let me know what parts are broken in the diagram and I will look up the correct part numbers for you.
If you still have the column, start taking it apart to identify what is broken rather than guessing at what you might or might not need. Take pictures and lay things out as they were removed so you can put it back together.