geez, at these prices, I'd put a stock AM radio in to fill the hole, wire in a USB adapter to charge it, and pick up a Sandisk Sansa MP3 player like these

sansa fuze

sansa fuze video

and just have it setting in the ashtray....hook it to an amp with a 3mm stereo plug to RCA jack cord to power the speakers...

the sansa has an FM receiver in it to listen to the radio, and a slot for SD cards to expand the capacity beyond it's built in 4gb....