I was originally looking for the KaodTech bypass listed on the alfaobd website. Couldn't find that one. Eventually landed on this one:
There's a half-dozen other identical ones on Amazon. The keywords are "Chrysler" and "12+8." I got this one because it would arrive the fastest (it said "Wednesday" before it was in may cart; then became "Thursday" at checkout).
To be clear, I haven't received it to verify it works. Looking at the connections in my truck, it appears to be right, and the comments on Amazon say it's right. When it comes in, and I hook it up, I can confirm.