Custom Dynamics Integrated Fat Boy LED Taillight is a simple plug and play addition to the rear fender on 2018-2023 Harley-Davidson Fat Boy (FLFB/FLFBS). Mounting with double-sided automotive grade tape, it adds 40 super bright LEDs as a running and brake light. Left and right turn signals split the taillight bar with 20 red LEDs per side. Designed and manufactured by Custom Dynamics as a compatible aftermarket accessory for certain Harley-Davidson models. Does Not Fit Canada (CNA) or International (HDI) Models.