I have the dynamix 816, and it's dimensions are as follows:
Total unit: 194 mm x 130 mm
Without bezel: 189 mm x 120 mm
Viewable area: 178 mm x 108 mm
if you relocate the buttons to the side (or just remove them), that would come pretty darn close to the 200mm x 100mm you are looking for.
This is an 8" screen, so that's actually a little more than what most people do in a double din space (because they want to keep the bezels.) So I'd say, something with this size would be a good bet.
Welcome to the forum. Hope this helps.