The steel hatch is exactly 19.5 Inches wide. Measure off this amount, for cutting, and add 1/16" to 1/8" for clearance. Yes! Your 'line' will go into the stud holes, don't worry the washers, although smaller, will back-up and hole for the studs. You will need the Washers Small to clear the Steel Hatch for Removal/Install.
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