Simplyspeakers is new to me, pretty cool site. Am going to watch some of their repair videos and see what I can learn. I had heard that the Ken Harrison Model SP 570 for 67 through 73 Mustangs should be a direct fit and it's about 20 bucks. Anyone used one of of them ? Pintocrazed their are shops that do just that. They gut your radio and put in everything you can think of, inputs, outputs, bluetooth, the works. You turn the power off-on-off-on and rotate through the modes very spiffy.