FMVSS 108:https://optronicsinc.com/RESOURCES/FMVSSRequirements/TruckBUSMPVs.aspxMy understanding (but please correct me if I'm wrong) is that the vehicle must have all the lights/reflectors/etc that were required when it was new, which are not necessarily today's requirements. My 1990 bus did not come from the factory with all the lights needed now, but it's still legal (I hope). John
Is there a rule regarding the color of a side marker light?