sangre-
The Magnadyne radio in my 2008 coach is a 1.5 DIN unit. This is a hard-to-find size. Magnadyne offers a cover plate kit (
link here) for those who convert down to a single-DIN unit.
Manuals for the Magnadyne M9900 1.5 DIN radios are at
this link.
I believe that Magnadyne units M2 and later are double-DIN. Some (M3/M4?) have an offset faceplate that may allow mounting in some 1.5 DIN holes.
Here's a link to Magnadyne's current offerings.
Of course, depending on how much you're willing to modify the mounting and wiring, you have your pick of replacement units from
all the usual manufacturers.