Cheap Mercedes-Benz Vito Wheel Arch Liner

No — the Vito moved from the W638 generation (1996–2003) to the W639 generation (2004–2014), so a 2004 liner and a 2012 liner are both W639 parts and should be from the same platform, but your 2004 falls very early in that generation and there is a known mid-generation refresh around 2010 that may have brought pressing changes to some panels. Name the boundary confidently: W639 runs 2004–2014, facelift circa 2010; whether the arch liner changed across that facelift is something you should confirm with the breaker against both registration numbers before buying.

For the front arch liners wheelbase is unlikely to matter, as the front bodywork is essentially the same across short, long, and extra-long wheelbase variants. The rear arch liners on a van can be a different matter because the rear body section extends with the wheelbase, so always tell the breaker whether your Vito is SWB, LWB, or XLWB to make sure you're matching the right part.

It can do — barn doors and a tailgate are different rear-end pressings and the surrounding panels, including the lower rear quarters where arch liners sit, may differ between the two configurations. Always tell the breaker which rear-door setup your van has so they can pull a liner from a matching donor vehicle.

Trim level does not affect fitment for wheel arch liners — the liner is determined by the generation, wheelbase, and body configuration, not whether the van is a base, Sport, or Tourer spec. You may find that higher-spec vans had body-coloured or extended plastic cladding around the arches as a cosmetic extra, so visually check the condition and style of the part you're being offered matches what's on your van.

This spans the generation change: the W639 ran from 2004 to 2014, and the current W447 generation launched from 2015 onwards, so a 2014 donor and your 2016 van are on completely different platforms and the liners will not interchange. Make sure any part you're quoted for is sourced from a W447-generation Vito to stand any chance of correct fitment.

No — engine and gearbox have no bearing on wheel arch liner fitment whatsoever, so whether your Vito is a 109, 111, 114, or any other power variant makes no difference to which liner you need. Focus on telling the breaker the generation (W639 or W447), the wheelbase, and the rear door configuration, and ignore the engine code entirely for this part.