How Agricultural Distributors Map OEM Part Numbers to Verified Aftermarket References

A methodology playbook with fictional identifiers: map an OEM reference to the original manufacturer reference and then to aftermarket candidates, with evidence, fitment and approval rules.

Map in three hops: the OEM reference your customer quotes, the original manufacturer reference behind it, then aftermarket candidates. Each hop is a relationship with evidence, a fitment scope and a named approver. A candidate is not a substitute until someone with authority approves it for a stated model and serial range.

The three hops

1

OEM reference to original manufacturer reference

The number a machine owner quotes may be the machine brand’s own number for a part made by a third party. Record both identifiers and the source that links them.
2

Original manufacturer reference to aftermarket candidate

Each aftermarket product is proposed as a candidate with the attributes that were compared. Use EQUIVALENT_TO or COMPATIBLE_WITH labels deliberately: equivalent means interchangeable, compatible means works together.
3

Candidate to approved relationship

A named approver accepts the candidate for a defined fitment scope, or rejects it with a reason.

Evidence and fitment requirements

Requirement	What to store
Fitment scope	Machine model and serial number range the relationship applies to
Supersession chain	Ordered list of REPLACED_BY steps, each with its source and date
Compared attributes	Dimensions, material, specification values actually compared, with units
Evidence source	Document or record that supports the claim, with a link or reference
Approver	Role or person who accepted the candidate, and the date
Rejection reason	Stored as a negative relationship (NOT_SAME_AS or a rejected candidate) so it is not proposed again

A supersession in the OEM’s own data is a REPLACED_BY fact from the manufacturer. An aftermarket equivalent from another producer is a different relationship. Keep them apart, as the relationship guide describes.

Illustrative records

Hop 1 and 2, with fictional identifiers:

oem_ref,original_mfr_ref,aftermarket_ref,relationship,fitment_scope,evidence,status
OEM-A-12345,MFR-X-9001,AFT-Q-4410,EQUIVALENT_TO,Model Z100 serial 1000-4999,datasheet-ref-001,candidate
OEM-A-12345,MFR-X-9001,AFT-R-7720,COMPATIBLE_WITH,Model Z100 serial 1000-4999,datasheet-ref-002,rejected

Supersession chain and approval, also fictional:

from_ref,to_ref,relationship,source,approved_by,approved_on,decision_note
OEM-A-12000,OEM-A-12345,REPLACED_BY,oem-bulletin-ref-003,,,manufacturer supersession
AFT-Q-4410,OEM-A-12345,EQUIVALENT_TO,datasheet-ref-001,catalog-owner-role,2026-10-12,approved for stated serial range only
AFT-R-7720,OEM-A-12345,NOT_SAME_AS,datasheet-ref-002,catalog-owner-role,2026-10-12,rejected: attribute mismatch

Workflow notes

Normalize identifiers first (case, separators, leading characters) as described under data normalization, but keep the original string.
If you cannot establish reliable evidence for a pair, leave it unlinked. A blank is safer than a guessed equivalent.
Use the functional-equivalent playbook for attribute comparison and the guide on matching without GTINs for identity evidence.
Never promise automatic substitution. The approver is a person or role with authority, not the matching run.

Guide

Product Relationship Types

EQUIVALENT_TO, REPLACED_BY and the rest.

Playbook

Find Functional Equivalents

Attribute-based comparison workflow.

Guide

Match Products Without a GTIN

Identity evidence when no barcode exists.

Glossary

Data Normalization

Cleaning identifiers before matching.

FAQ

Is an aftermarket cross-reference the same as a verified equivalent?

No. A cross-reference is a claim. It becomes a verified relationship only when it carries evidence, the fitment scope it applies to, and a named approver.

What should happen when a candidate is rejected?

Record the rejection as a negative relationship with the reason, so the same pair is not proposed again and reviewers do not repeat the investigation.

Do the example part numbers on this page exist?

No. Every identifier here, such as OEM-A-12345, is fictional and exists only to illustrate the method.