UK cars are right-hand drive, so the driver's blade is the right-hand one as you face the car — 26", and the passenger blade on the left is 18". The rear blade is 13" and usually has a different fitting from the fronts.
The front arms take a Push button fitting: check the pack says that fitting, or that the blade's adapter set includes it. Length alone is not enough — a blade that is the right size but the wrong fitting will not clip on.
Watch for left-hand-drive sets: some Bosch and Valeo twin-packs sold on Amazon.co.uk are the European LHD pairing (longer blade on the left). If the two lengths are the wrong way round for this car, it is an LHD set.
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Does the Audi A3 8V have a rear wiper, and what size?
Yes — 13". 330mm. Confirmed for the hatchback body style across the 8V range.. Rear blades often use a different fitting from the fronts, so buy it separately rather than as part of a front pair.
Which wiper fitting does the A3 8V use?
The front arms take a Push button fitting. Described as "Slim Push Button" arm attachment on the front wiper arms.. Most branded blades ship with an adapter for it; check the pack.
Will a Bosch or Valeo twin pack fit the A3?
Yes if it is the UK (RHD) pairing — the longer blade goes on the driver's side, the right. Sets listed for the European market are often the mirror image.
Other cars that use a 26" driver-side blade
14 other cars on this site share this fitting — the passenger side and the fitting usually differ.