https://digi-tails.com/plymouth/roadrunner/1968

Here's the company that makes them. I sent them one of my 68 Dart tail light housings a couple years ago. Still waiting on them to get a kit tooled up for me. I was hoping it would be a plug and play type deal into the existing tail light harness but it looks like you have to run a dedicated power wire to the boards. Oh well, it will look cool and be lots safer so I'm not going to complain about a little extra wiring.