Genuine OEM Volkswagen Side Rail Extension, part number 5Q0804455A. This part serves as an extension for the vehicle's side rail structure, contributing to the overall chassis integrity. It is positioned as part of the side rail assembly. Constructed from durable steel, this extension is designed to meet factory specifications for fit and strength. Genuine OEM parts are crucial for body panels as they ensure the exact bolt pattern, factory contour, and proper surface preparation for paint.