Standard 9x7 and 16x7 openings
That matters because it means we're not guessing at sizes. Houses in Wixom were mostly built around 1985, well after the service area's overall median of 1965, so you're looking at standard-size openings: single doors at 9x7, doubles at 16x7, built for factory steel sections rather than the custom one-piece slabs you find on older housing stock elsewhere in the area.