You'll definitely need a new tumbler assembly with a matching key. You can get a used one or get one from the dealer with a key that will match the rest of the car.

You'll have to remove what's left of the old tumbler and hope that whoever hacked the old one out didn't damage the steering lock assembly. It's a very intricate process that's hard to describe without seeing what you're dealing with.

Sixto
95 S420
87 300SDL