A stock radio can be outfitted with line-level inputs, which would accommodate an MP3 Player or ipod... that's the way to go if you want the "stock" look... I know there are repro radios made but I don't know if they have any special inputs.
1960 GMC Panel w/ 305 V6, 4 Speed TV Repair Van "The Monitor Lizard" 1961 Chevy Apache 20 283, 4 Speed, Hydrovac www.picturetrail.com/starchief