Just finished installing a Custom Autosound 630 radio in my 66. Truck has never had a radio, but I installed a antennae when the body was redone. I have a stock AM rebuilt radio but wanted something better. Radio fit perfect, and I installed Undercover speakers under the seat and 5 1/4in Blaupunkt speakers I the sides of a console with plug in jacks for easy removal, no holes drilled or anything modified, Velcro holds things firmly in place. Everything worked GREAT and sounds very good! USP hookup is really cool for MP3 player. 2000 songs in the size of a matchbook and controlled from the radio. Posted in case anybody wants to do something similar.