For the 2015-2022 Lexus NX models (including NX200t, NX300, and NX300t), the "Fender Wing Sub-Assy" generally refers to the structural Upper Rail (part 53705-78020) or the exterior Front Fender Moulding trim pieces, depending on the specific parts catalog . These OEM components serve either as critical crash safety structure on the engine bay's upper frame rail or as decorative side mouldings attached to the front fender, with specific variants for standard and F Sport trims .