Many fasteners (bolts, nuts, clips) are listed under a separate "Hardware" page. Look for a small link that says "Standard parts" or "Fixings" within the same subgroup.
Most online EPCs (including 7zap) allow printing to PDF. Save the diagram with the part number highlighted. Bring this PDF to the parts counter. A dealer will instantly understand exactly what you need.
: The system typically displays two types of numbers: the GM number (often found on the part itself) and the Catalog number (used for ordering).
Let us walk through a practical example: finding the for a 2008 Opel Zafira B 1.9 CDTI (Engine code Z19DT).
: Copy the OEM part number to purchase through authorized dealers or online retailers .