AM FM conversion

Theres alot of places that do this service if you look online and will even install a AUX port to play an Ipod or mp3 player and retain the stock appearance,but man,they are pricey.I wanted to do this to keep my interior looking near stock but was scared away by the price,lol.Im thinking of trying this myself If I can find an old Chrysler AM radio to experiment on because I dont want to gut my nice working AM radio.