You need to edit FX_interior1.dds to get rid of all the white parts.
If you open the dds in Photoshop or whatever program you use, you'll see a little white square with a black outline. Colour in that square a fairly dark grey colour.
The first few pics I had found of the 1000 MB had the full grille surround which threw me off a bit, 'til I came across that pic with the side pieces removed.
Anyway, have a go with this one. No idea if it will be easy or not.