Looking at knightro84's old posts, it looks like you need a 10' coaxial cable with a Fakra Type-A connector at one end and Type-B at the other. Judging by the pictures, it looks like it is a female connection at both ends. I think the type A and B connectors are color coded black and white, respectively. I'm guessing you need a 10' RG174 cable with the black Fakra at one end and the white at the other. I wouldn't buy off my guess but thought I would bump the thread to see if someone who actually knows responds.
I recently bought a 2021 Limited. Since inventory was so low, I couldn't get all of the options I wanted which includes the technology package. Reading through the posts here, it sounds like I should be able to buy the mirror, wire and brake light and do it myself pretty simply. Can someone confirm that for me please? On the display, there is an icon for a cargo cam, it seems. Does this brake light provide that functionality too, or just the digital rearview mirror?
For what it is worth, we rented an RV based on the Dodge Sprinter. It had a digital rearview and it worked great. A wider angle of view, bright crisp image and obviously anything between you and the rear window isn't in the way. After a while, I forgot it was a video screen.