Just the designated adapter for fiero, that's it! you will just use the main part and it gets installed inside the steering wheel hub with some drilling of 4 holes and nuts and bolts, see pic below,(horn works too!) more pics available on page 19 of my photobucket site with build pics,
However.... Im not sure of the real airbag clearance space, but if you use a replica one Im sure it's no problem, The OEM adapter goes behind the wheel, you may can put the grant adapter behind the wheel but there will be an unattractive gap between wheel and column...just so you know