This upper sleeper extension is designed as an OEM-style replacement panel for select Western Star 5700XE trucks, covering model years 2020 through 2024 and offered in both driver and passenger side configurations. Built to match factory specifications, it serves as a direct replacement for OE components, helping maintain proper exterior alignment and finish along the upper sleeper area. Manufactured as an original replacement part, it is intended to restore the truck's intended design without requiring modification during installation. Each extension panel is sold individually and is engineered for a precise fit based on the specific side of the vehicle. Its construction is intended for heavy-duty use, supporting long-term durability in commercial trucking environments where exterior cab components are exposed. Because it follows OEM replacement standards, it is designed to integrate with existing mounting points on compatible models. Fitment is specific to Western Star 5700XE applications, so verifying the correct side and model year before purchase is recommended to ensure proper installation and alignment.