70 340 Swinger Broadcast sheet and other questions

Many thanks for the codes and the bumper info. For the bumper where exactly do the guards go (how far from the centerline)?
My VIN is LM23H0R153001.
Another question, the car has a factory radio but the code is not on either broadcast sheet. The car has many options so it would be hard to believe it did not have a radio. Was an AM radio stock with a Swinger?