For the silver, I use a silver/metallic sharpie. Maybe not the best way, but it's cheap. I believe 70s had a ribbed texture and not wrinkled like the parts pictured. Although maybe it changed during 70 from early to late production

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram