Several websites have reverse-engineered or mirrored older GM EPC data. The most popular free options include:

These diagrams show components separated with to help you identify exactly which clip, bolt, or major assembly you need. Retrieve Part Numbers

Disclaimer: Some EPC access requires a subscription or paid service, as noted in various online providers. Go to product viewer dialog for this item. Opel EPC 4.25 10/2014 Parts Catalog

The Opel EPC is a software application that contains a complete breakdown of every component in an Opel vehicle. It was initially used exclusively by dealerships for ordering parts. It is an interactive catalog that allows users to view detailed exploded diagrams and find original GM part numbers.

Beyond VIN searching, the EPC allows users to look up parts by category, model, model year, engine code, or vehicle attributes. This is particularly useful when a VIN is unavailable or for broader research. Some online versions even allow you to search using an existing part number, showing you which models use that component (useful for finding used parts).

: Engine blocks, cylinder heads, turbochargers, and transmission assemblies.

: Drill down into the specific system you are repairing.

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: Type the 17-digit VIN into the primary search bar to lock in the exact vehicle configuration. If the VIN is unavailable, manually select the model, year, engine code, and body style.

: One of the most popular global databases. It features exploded diagrams where you can click on parts to find their specific OEM numbers.

It often displays two critical numbers: the original GM part number (frequently stamped on the part itself) and the Opel catalog number used for official ordering .