New to me Ml500
 

Greetings All, getting to know my 03 Ml500, 109000 miles. PO had 100k service and brakes all around replaced. PO also just had power steering pump and fuse box module replaced. Issues: no audio from FM radio but cd, am and WB work. Needs underbody panels.
If anyone knows where I might get the underbody panels, I would be grateful.

Best bet for underbody panels is a pick n pull. You'd be looking for a wrecked one with good panels. Runner up would be a "full service" junkyard. Also pick n pull for the radio, assuming it's the deck.

My local yard has a 03:

http://www.wrenchapart.com/search-inventory/

One possibility on the radio could be a bad antenna amp in the tailgate. Sometimes even just cleaning up its contacts helps.

Consider an aftermarket though, if the head unit is shot. You'll need a replacement amp too, since the Bose is fiber-optic, but you'll be in the 21st century.