I have the OEM taillight assembly. But it's in a box, behind some stuff, under some other stuff, in the shed, way out back. When it quits raining (someday), I'll crawl under there and check the connections. The resistors that came with these lights unplug. So if I can pry the 3M VHB tape loose, I can swap them side-to-side to see if that makes any difference. And if so, I can measure the resistance to buy a replacement. Looks like the seller is no longer around, so I'll have to reverse-engineer something in that case.