Did they have a horn in them? Just installed one from a cobra mustang that looks the same minus the center cap. No horn inside the cap. Not even a place for one.
The later models Fairmont, Mustang etc had the horn on the turn signal lever. Push it in. So those wheels dont have a horn button on the steering wheel.
Like Darren said, the Ford Sport Steering wheels came with and without center push horn pads depending on the model/year. A quick way to tell is to flip the wheel over and see if the base has the horn slip ring contacts. You can make a non-horn pad steering wheel into a horn pad steering wheel, someone on here did it...
I hated that horn switch in the turn signal handle! You either turned on one of the signals or totally forgot where the damm thing was!