Yeah you would have to ask Byron. My HX Sandman is that grey fleck stuff over the blue paint. Its had a respray though so you can't really tell from it. My HX Kingswood is body colour in the back. I think that Kingswoods were body colour and belmont was grey fleck.
Really need to ask Byron.
Personally I reckon go with the body colour. Looks heaps better. You must need to use a special primer to get the paint to stick to the galvanised tray though.