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Fitment on a used rear bumper varies by vehicle, so a bit of detail goes a long way. Our request form covers what breakers need to know, so every quote you get back is for the correct part:
The Signum was produced from 2003 to 2008 as a single generation, based on the Vectra C platform, and was only ever offered as a five-door hatchback. Bumpers from across the 2003–2008 production run are broadly from the same generation, but mid-run pressing changes can occur, so always confirm with the breaker against your exact registration before buying.
The Signum ran as one continuous generation from 2003 to 2008 on the Vectra C platform, but Vauxhall made a facelift update around 2005–2006 that may have affected exterior panels including the rear bumper. You should name this boundary clearly to the breaker and ask them to check the part against your specific registration, as crossing a facelift boundary is exactly where fitment can catch you out.
Trim level does not affect rear bumper fitment on the Signum — the same shell was used across Design, Elegance, and Vector grades. You may find cosmetic differences such as paint finish, trim inserts, or sensor hole configurations between cars that were optioned differently, so mention any parking sensor setup to the breaker when you enquire.
The Signum shares its platform with the Vectra C but has a distinct hatchback body with a different rear-end design, meaning the rear bumpers are not the same part. Whether specific pressing variations between closely related platform-mates interchange is something you should confirm with the breaker against your registration rather than assume.
No — engine and gearbox choice have no bearing on rear bumper fitment for the Signum. Focus your enquiry on the model year and any facelift details, and let the breaker cross-reference against your registration to confirm the correct part.
Give the breaker your full registration number, the model year, and whether your car has rear parking sensors, as sensor hole positions can vary. It is also worth mentioning your paint colour code (found on the VIN plate) if you want a colour-matched bumper, though respraying a used part is common practice in the UK.