Focus radio code

How can i find the code to unlock my ford 5000 rds Ser. m058093

I can get you the code: 0335

You've interrupted the power to the radio and it senses you've tried to steal the radio (an antitheft function). Just above the cassette/CD door (in the face of the radio) is a teensy-weensy hole...using a paper clip, with the ignition on, press the end of the paper clip into this hole and gently PUSH...if this doesn't work, (or there isn't a hole) take it to a car stereo installer and have it looked after.
Good Luck