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I'm not an expert as I've never done it, but my understanding is that the only thing needed is converting the 8 pin harness on the 2017+ lights to a 6 pin harness that most if not all pre-2017 cars had. Special editions or BRZs may have had an 8 pin - I'm sure someone else will chime in on that.
Someone here on the forums used to sell a 6 pin to 8 pin adapter. You can also find them on eBay, but if you want something quality (remember, you're playing with the electronics on a fairly expensive device) you're probably best off pinning it yourself. There are threads here that point out what pins go to what.
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