I have created the “RT” stripes for the '15 Dodge Challenger Hellcat (since there is no “regular” version of the Challenger). Here are three different examples of car/stripe colors, some have bright wheels and others have black wheels, all livery colors I’ve done are available by searching my Gamertag (Star Trek Texan). If you have a specific color combo (car color, stripe color, wheel color) let me know and I’ll get to work and upload it. By the way - the picture of the white Challenger livery with red stripes? That’s an identical match to my own personal real-life '15 Challenger. 
