Semi Universal. Our flush mounted design allows for flexibility that's often needed in the wide variances between 1-window egress to the next. Designed for window wells that measure between 24 and 26 in. in depth from the homes foundation to the outside edge of the well and widths measuring 64 to 66 in. metal window wells with large radius front corners. Not wide enough, No problem, simply add a feldhawk spacer to your cover to make it wider.