I recently bought seatbelts from a ´71 Challenger and are going to put them in my 1970 SE. My car has the C15 Seat Belt group option and now I´m wondering where to connect the wire from the front seat retractables. I was told the wire should lead to a buzzer somehow. Is this "part of the C15 option" or is that only possibly to connect if you have a car from 1971-74? I have the service manual (big yellow one, you know...) but haven´t seen this anywhere.
Robert