Only options I know are to pull the plastic using a heat gun to help soften the adhesive and a putty knife. Otherwise cut the old one out and install a new one that comes with a bracket that has flange that mounts to the top of the opening.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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