It's from Detroit Tools.

From one of the threads in the link.

"It's called the 426HemiVSR. I love it.
You can order it directly from Detroit Tools
Contact Mike Pollock at 1-313-942-2816"

When I was trying to buy one in 2014 they wouldn't return my calls at that phone number.

I don't know if they're still in business.

Mancini Racing used to sell them, but took them off their website since 2014 (they were out of stock at that time).

I bought one from a member here back in 2014, but have since sold it to a friend after I traded off my car that had the Gen 2 Hemi in it.