Mercedes-Benz B-Class Sill Replacement Parts

No – the W245 (first generation, 2005–2011) and the W246 (second generation, 2011–2018) are completely different platforms with different body pressings, so the sills are not interchangeable between these two generations. Always identify which generation your car belongs to before sourcing a used sill from a breaker. If you're unsure, give the breaker your registration and they can confirm the exact generation.

The W246 ran from 2011 to 2018 and received a facelift around 2014, and it's possible that sill pressings changed between the pre-facelift and post-facelift cars – this is something you should confirm with the breaker against your registration rather than assume either way. Within the same pressing revision, year of manufacture and engine choice make no difference to sill fitment. Confirming the exact part number with the breaker is the safest approach.

No – whether you have a petrol, diesel, or electric B-Class, and whether your car is an SE, Sport, AMG Line, or any other trim level, the structural sill is the same pressing for a given generation. Trim level can affect whether your car has add-on sill skirts or mouldings, so be aware that a cosmetic trim strip from a Sport or AMG Line car may not match if you're fitting a sill from a base SE. The underlying sill panel itself is unaffected by trim or engine choice.

Yes, the sill – the structural panel running along the underside of the body between the front and rear wheel arches – is a standard body component on the B-Class. It exists on every variant of both the W245 and W246 generations regardless of engine, drivetrain, or trim. If you've had accident damage or corrosion along the lower edge of the body, the sill is the part you're looking for.

Yes, near-side (NS, passenger side) and off-side (OS, driver side) sills are mirror images of each other and are not interchangeable, so you must make sure the breaker is supplying the correct side for your repair. On a UK right-hand-drive B-Class the OS is the right (driver's) side and the NS is the left (passenger's) side – always specify this clearly when requesting a quote. Getting the side wrong is one of the most common and avoidable ordering mistakes with body panels.

The A-Class and B-Class share platforms – the W176 A-Class and W246 B-Class are both on the same MFA platform – but because the B-Class is a taller, wider MPV-style body compared to the hatchback A-Class, the sill pressings are different and the parts are not a straight swap. Whether any specific pressing could work is something to confirm directly with the breaker against both registrations, as they will know the exact part numbers involved. Do not assume A-Class and B-Class sills are interchangeable without that check.