I designed this for my 1974 Ford F250, tested it, and use it to this day.
To install:
1. Remove old stereo and plastic trim
2. Remove only the two lower screws of factory stereo mount
3. Install new bracket over top of old
4. use included self tapping screws to attach top of new bracket to old
5. remove old bracket, cut off excess metal
6. install new/old metal bracket as one piece
7. slightly trim plastic trim that goes over radio to clear new stereo
Included:
Metal bracket
Self tapping screws