I thought it was only the pov pack Tritons that had body colour etc. showing through the arches (tub, engine bay etc.)
I don't know how to post pics but today I picked up a $3 can of matt black spray paint and went over the inside of the wheel arch/cavity, making it all a universal flat black colour, it looks a lot more finished, and not a bad cosmetic mod for $3, anyway.. give it a go
Dave