I cannot recall the pedestal on my 1987 pedestal but a photo of your pedestal might help to identify its manufacturer. Long shot but contact Edson Marine with your photo to see if they can confirm they made it and model with parts list at Edson Sailboat Steering & Wheels: Pedestal & Steerers
My 34 pedestal is a Merriman Yacht Specialties. Long out of business! You can check here on site for the section that holds the levers. If you can repair the seat then installing a new bolt is not difficult. Good luck.
Photo(s) of the pedestal would be helpful in identifying the manufacture and photo(s) of the broken part(s) would also be helpful. If you cannot find a new or used replacement part suggest dissemble it/them and have your local machine shop custom fabricate a new one.