Center High-Mount Stop Lamp (CHMSL) - 2018 Mustang

The 2018 Ford Mustang S550 facelift requires CHMSL part JR3Z-13A613-A for decklid-mounted applications, superseding the 2015-2017 FR3Z-13A613-A design with updated lens geometry matching the 2018+ rear styling. When junkyard hunting, prioritize 2018-2023 coupes; verify the donor lacks the Performance Pack spoiler, which relocates the CHMSL to the wing (different part entirely). Inspection focus: LED strip segment failure is common—test for dim sections indicating internal diode failure—and check lens seals for water intrusion evidenced by condensation. Installation requires trunk liner removal and decklid trim panel extraction via push-pin fasteners. The 2-pin connector is keyed differently than 2015-2017 models, preventing accidental interchange. For convertibles, confirm bezel alignment as the decklid radius differs slightly from coupe variants.