1997 Saab 900 What part has the spring for the ignition key

Hello, the spring that pushed the key to the "ON" position after starting is worn/broken and I want to know what is the part that has the spring for the ignition? Is the spring in the electrical part, the ignition switch? Or is the spring in the key cylinder? I am wanting to replace the part that has the spring to fix the problem but don't know which part to buy. thanks for the help.

Cheers