Cross-reference
cross-ref · equivalence · OE cross · interchange
A cross-reference is the link established between one part number and its equivalents at other brands or at the vehicle manufacturer. It is the operation that turns a number found on a removed part or an old invoice into something the distributor actually holds in stock.
Director of publication : Florian Précigout
Equivalence is built from supplier declarations inside the catalogue, not from geometric comparison. A supplier declares that its reference covers a given OE number; the catalogue turns that into a link. The chain therefore rests on a supplier statement, and its quality depends on the quality of that statement.
In practice it is the counter's most frequent move: the workshop gives a number, and you need to know where that number came from before crossing it. An OE number, a supplier number and a casting number do not cross the same way — the third, in particular, is not a commercial reference at all.
Crossing proposes, it does not validate. An equivalence found still has to be checked against the identified vehicle: the same reference can be equivalent for one version and not for another.
The trap
Crossing without checking the vehicle. An equivalence declared by a supplier holds for a defined applicability scope — outside it, the numbers still match while the fitment does not.
Frequently asked
Is a catalogue equivalence a fitment guarantee?
No. It is a supplier declaration carried by the catalogue, valid within the applicability scope that supplier defined. Checking against the vehicle remains necessary.
Can you cross a number found on a removed part?
Yes, and it is the most common case — provided you identify what kind of number it is. A supplier number crosses directly; a casting number usually leads only to a family of parts.