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How To Read An OE Number

The number on the old part is the fastest way to the new one.

An engine bay with a red intake

The Number On The Old Part

Every part a car maker fits carries its own number, the OE number. Find it on the old part and you have the fastest way to the new one.

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Where To Find It

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Brake Discs
On the hat, stamped
Filters
On the casing, printed
Alternators
On the plate, riveted

Spaces, dots and dashes do not matter: 5Q0 615 301 G and 5Q0615301G are the same part.

What The Match Tells You

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A laptop on an engine cover
A rev counter at night

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Sofia Marin
Written By

Sofia Marin

Head of fitment data: she keeps the vehicles and the OE numbers behind every fit tick.

Two Comments

  • James Whitfield
    James WhitfieldJul 23, 2026

    Found the number on my old caliper exactly where the table says. Lorem ipsum dolor sit amet.

  • Tom Arden
    Tom ArdenJul 24, 2026

    At the garage we check the OE on the box against the old part before anything goes on the car.

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