Maybe your old ignition cylinder can be used? Some of our vendors have Genuine GM ignition parts. Autozone can sell you the ignition switch in black or chrome if I remember right and also will sell you the:
Steering wheel puller - $40
Column Plate depressor - $20
Keep your receipt. When you finish, tools go back for full refund - it's all part of their tool/rental/deposit/whatever program.
Here's Youtube video for ignition removal for '86 Le Sabre which gives you the gist of it: