HelloCustomer, I'm Chris, a current Ford Lincoln Mercury employee.
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Door panels should not be needed to be removed to replace the speakers o nthe new model 04 150. You just pop off the cover.
To gain access to the radio you need to remove the center finish panel which is also pryed off gently.
I usually start at the lower end near the AC controls. I know it feels like it will break but do it gently. Once you get it started at one corner it will pop off the rest of the way easily.