caj, I believe there's a 1:18 diecast of your car. In fact, my friend helps the manufacturer with color schemes and options, so he was responsible for it. I've emailed him to ask him so that you can find the actual diecast and not just something a hobbyist created. I'll post again when I find out more.
EDIT: I may be mixing it up with this:
http://www.diecastdepot.ca/index.php?PID=12130
But still waiting for my friend's response on the Challenger.