I bought the 629 model for my 1991 300zx 2+2 with driver airbag. This item does not replace your factory clock spring, you will still use it. The kit also comes with some connectors that are supposed to mate with the factory harness so you can wire in the horn and keep the airbag system happy, these connectors did not fit my harness what so ever. I had to cut the horn plug from the factory wheel and wire it in that way. When it's all said and done the adapter fit well for my MOMO competition.