Used Vauxhall Signum Door

The Signum was produced as a single generation from 2003 to 2008, so doors from anywhere within that range are your starting point for a match. That said, confirm with the breaker against your registration whether any mid-run changes affect your specific car, as minor production updates can alter fitment even within the same generation.

Both are within the same single generation (2003–2008), so there is a reasonable chance of compatibility, but the Signum did receive updates during its production run and the breaker will need to check your registration to confirm whether those changes affect door fitment at your specific year. Never assume fitment without that check.

Yes, side absolutely matters — a nearside (NS, passenger/left) door will not fit the offside (OS, driver/right) aperture and vice versa. Always specify NS or OS when getting a quote from a breaker, and double-check that the part they have matches the side you need.

The Signum was sold in trim levels including Design, Elegance, and Elite, but trim level does not affect whether the door shell fits the aperture — the frame and fitment are the same. You may find cosmetic differences such as different glass, mouldings, or interior trim between trim grades, so mention your trim to the breaker so they can flag anything you might need to address.

No — engine choice has no bearing on door fitment whatsoever, so whether your Signum has a petrol or diesel under the bonnet you should focus entirely on the year and the correct side (NS or OS). Colour is also not a fitment issue, as a used door can be resprayed to match.

Whether a specific door was built with electric window regulators, heated mirrors, or other feature variants depends on the original specification of the donor car, and these details can vary even within the same trim level and year. Confirm exactly which features are present on the door the breaker has before you buy, checking against your registration and your car's original spec.