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If you've updated to the '06+ Taillights, you don't need a new harness; you need to remove the plastic clips on the taillight assemblies. Text me if you have any questions.
I have an '04 and i put on the '06 lights a few monthes ago. They came with just the assemblies; no bulbs or anything. I pluged my factory bulbs/harness in, only to see they didn't "click in". After checking it out, i removed a plastic ring from the taillight assemblies, then the bulbs fit fine.