Cam is quite correct about the keys. However, my econoline radio requires two U-shaped removal tools that engage four round corner holes about 1/8" diameter each. If your radio is similar, the U-shaped keys are what you need (available at Autozone etc). Also do not try to bend a coat hanger to form the U's as a DIY solution as the keys are specially machined at the tips to unlock the retaining clips within the radio assembly. | 
