Supercheap stock all the Powerplus spray packs and will have desert rose metallic in stock in all stores...the factory silver Nissan colour was from Autobarn, they make to order.
You need to give it a bit of force to slip it over the PRND32 section, go from the back forward though, there is a little screw driver lug on the right hand side (just left of the rear of handbrake boot) to help you pop the clips.