I've read a couple online articles about motorcycle headlight rules here in the US and it does seem that a federal law states 8" from light to light as the max distance apart.
I have seen some of the early Slingshots and they had their main headlights over the front tires embedded into the body work. Since then they have relocated their main headlights to the center of the main body work and only have driving lights/turn signals outward mounted.
So if Polaris changed their lights to conform, it must be a thing. Now how well is it enforced, who knows. I have a buddy down at the Lake Of The Ozarks that I got interested in three wheelers and he built a from scratch Moto Guzzi powered three wheeler. When completed he took it to Springfield for the highway patrol safety and title application. He has his headlights similar to the M3W originals mounted outbound almost to the fenders. He got his approval and title from the MO State Highway Patrol Troop C. Again if it's a law and Polaris conformed to the narrow headlights, maybe it's just a law that doesn't get enforced or maybe as some I've found, just don't know about all the new laws of their state.
I was talking with a trooper at a swap meet last year and he didn't know that MO had passed a Cyclecar law allowing people without a M endorsement on their driver's license to drive "car type seating and steering" three wheelers without it. You do still have to wear the helmet, but some states with the Cyclecar law included the deletion of the helmet requirement in their state law.
Even with all the laws here in the US, one does not know what's what and usually not many of authority can help with the correct answers.
