It depends on where they get installed. If they are installing over the belts already equipped on the officers, then you shouldn't have to do anything. If they are installing in a different location, then you would have change the drawable in lspdfr>data>outfits.xml. I believe component id 6 is for the belts, you would need to know what number its installed in. You can do this by searching for it in your apartment when changing clothes, on you have the drawable (and texture if applicable) then you would go through and update that xml.
id 6 will be the 6th component down, then go through the drawables