These are brand new radios' manufactured from the ground up, using the same replacement dial housings, knobs and buttons that folks are using to refurbish the original's. The preset buttons work just like they should, like truckernix said they actuate switches behind them. Inside the dash is another story the case is much smaller (About 10%) of the original's so that leave's plenty of room for electric wipers or AC (for the hotrod guys).
Brian for 6 volt trucks there's a voltage booster available to convert the 6 volts up to 12. As far as speakers go, the radio can be setup to handle 1,2 or 4 speakers. I have a 2 speaker panel setup to go in the stock speaker location under the radio in the center of the dash.
Mongo
