Oh, my apologies.. I thought you were referring to a bybyte frame!!
The mounting is not really much of an issue, its just that bit of the screen that gets clipped if you use a 4:3 display.
According to my double din bezels and dash kits, 173x98mm for the glass will be an exact fit (with rounded corners). You said your double din opening was 111x190mm, do you have a standard double din bezel that you can put in as this should give you a standard size cutout area of 173x98mm.
Or maybe this as an easier alternative?
Here is a standard DIY double DIN frame plate that actually has guides behind it that locate the bybyte frame exactly. So the bybyte can be easily glued to this. If you look carefully you will see that this plate with the bybyte behind creates a recess which the glass can perfectly fit in for a flush in installation. The good side of this is that you can easily use the bybyte for the LCD housing. The only down side is that you will need to cut this plate to whatever your dash opening is. You will also need to trim the bybyte opening to fit the LCD as it will now be mounted closer to the face of the frame.
The cut out of this plate is 173x98mm, which is the same as the metra kits & bezels (the ones i have got anyway).
This plate is actually made for this purpose and the surface finish is outstanding quality.