There is a small tab on the hinge side of the cover that needs to be cut off prior to installation. The diameter was correct for the opening on my 2004 f-150. I did not notice the tab before installing it and ended up cutting it off after the installation as I could not remove the lid for fear of breaking the entire assembly that I was replacing. Now it needs to be painted. Overall I am not completely satisfied, will probably end up changing it out again.
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