How do I remove the bolts that house the wires on the left of valve cover

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I am trying to remove the valve cover but can not figure out how to remove the wire housing that runs across the left side of the valve cover (the camshaft sensor wires also run through this housing.). However, there's a deep plastic piece that is very small and deep with a bolt through it and where the valve cover meets the head it looks as if the bolt has been welded. I need to remove the valve cover but can not get the two bolts on each side of the wiring housing. How can I remove those bolts?