On the dash of my 70 AMX I have a small hole and I think, but i'm not sure, that it was original and was used for a fader control for the radio. It's located on the lower part of the dash, a few inches to the right of the steering column on the hard plastic portion. I've seen a couple of other 70's; one dash had no hole, and the other had a small color keyed plug in that location. Also, if this car had rear speakers, where would they be located? Any information would be appreciated. Thanks guys!!!