Audio Systems: Help, correct components, ebay

Question
I recently bought an 03 ford focus sedan . The radio is all worn out from the sun I want to upgrade but the radio is huge and I want a new one to fit it's place please help. Matt

Answer
You can probably get a double DIN unit to match the hole or you can get a single DIN and use an installation adapter and harness.

Does it have the Blaupunkt factory system?  This will matter.

http://www.crutchfield.com/app/car/carselector.aspx?lp=%2fapp%2fCar%2fMyCar.aspx

try that link to see what is available.
Call them if you have further specific questions at 1-800-319-8264

Do not forget you may be able to use Ebay once you know the correct components you need.

JM