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that looks like the box where the different harnesses plug into next to the fuse block. I can't think of any other technical name for it. I'm not sure if thats going to be something you can go buy at a parts store though. Chances are its going to be a dealer or scrapyard item if you ask me
I agree with that_guy, looks like a dealer/salvage item. You have a question mark after "we need to replace it". What makes you think it needs replacing?
If it is above the obd2 port then it is the flasher, just went out to my D and it is the flasher. Should be able to get it for under 45 online or at autozone.