Yes it has to be bigger than original.Does the bezel holder actually need to be bigger? It looks like you can use the original size bezel but with a bigger cut-out made for the WG just fine.
There isn't anything I can take pictures of really. The tube won't mount in an original cab so I have to hold it in place myself to check anything, lol.
My English is not enough to explain it to you but let me try that.
The 19" Bezel has bigger Hole. If i keep the original size of the all bezel, the angle of the side parts is not possible to make a mold.
please check the pictures, i hope you can understand what i mean
This is the top looking Bezel 18"
This one is top looking Bezel 19". I keep the original size, only the cut hole is changed.This is why impossible to make a mold for it