I had a company modify my stock AM radio in my 66 GTO to am/fm with aux in/out. Found some kickpanels on ebay. Had to get the slimest comps I could find to fit them. With the back dash being metal I just made a enclosure for the sub I bought off CL and mounted the amps next to it. The sub and amps are getting switched out but the most expensive part was the modifying of the radio.