It'd be nice to know how deep those in-wall holes are, because the in-cabinet m60/m80 are roughly the same size, except the m60 is about 3 inches shallower. The M80 is 18 inches deep. Much too big for most walls.

But there is the in-wall M22 that could work, again depending on what kind of hole you're trying to fit.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing