I am acquiring a factory '66 am radio-8-track. Are there manuals available that cover installation? I understand a larger hole is required in the dash, and I also want to make sure the wiring is correct. Also, can anyone inform me as to the correct speakers and grills to use with the 8-track. I am replacing an original am radio, and I have the standard interior, including door panels. Any help, or directions to help, would be appreciated.