Two quotations arrive for the same brake pad, same part number, same quantity. One is 14% cheaper. Nine times out of ten the gap is not margin and it is not labour — it is three lines that one sheet lists and the other quietly omits.
An auto parts quotation is a cost map, not a number. Reading it properly is the fastest way for a distributor to avoid a margin surprise in month four.
Why Two Quotes for the Same Part Differ
The unit price on a quotation is a residual, not a starting point. It is whatever remains after the seller has decided how to handle packing, inland freight, documentation, and currency.
A seller who quotes ex-works with buyer-nominated packing will always look cheaper than a seller quoting FOB with a specified carton. The parts are identical; the commercial boundary is not.
So the first question is never about price. It is where the seller's responsibility stops, written as an Incoterm and a named place, with the packing standard attached as an annex.
The Six Line Items on Our Sheet
Every auto parts quotation we issue carries the same six lines in the same order, which makes a comparison against a competing sheet mechanical rather than interpretive.
| Line item | What it covers | Typical share of FOB |
|---|---|---|
| Unit price, ex-works | Part cost at the factory gate, per drawing revision | 72-80% |
| Export packing | Carton grade, inner protection, pallet, strapping | 4-7% |
| Inland and consolidation | Factory to warehouse, cross-dock, container loading | 2-4% |
| Documentation | Invoice, packing list, certificate of origin, test reports | 0.5-1% |
| Inspection | AQL sampling, measurement sheet, photo record | 0.5-1.5% |
| Currency and payment terms | Forward cover or financing cost embedded in terms | 1-3% |
Unit price carries the largest share, but it is also the line with the least room to move. Tooling is sunk, material is quoted against a published index, and labour in a mature cluster is not a bargaining chip.
Packing is where quotes diverge most, because packing is the only line a buyer can loosen without changing the part. It is also the line that decides whether a claim is paid.
Documentation and inspection together rarely exceed 2.5% of FOB. Cutting them is the single most common false economy we see in competitive tenders.
Cost Drivers Buyers Underestimate
Three inputs move an auto parts quotation more than buyers expect, and all three are visible in advance if you know to ask.
- Carton grade. A 5-ply replacement for a 3-ply carton adds roughly 1.8% to FOB and removes most compression claims on a two-high pallet stack.
- Mixed pallet configuration. A pallet carrying four SKUs costs more to build and more to count, typically 0.6% to 1.1% of FOB.
- Order frequency. Four small releases per year cost more per unit than one annual release, because setup, packing runs, and inspection recur each time.
Carton grade is quantifiable and cheap to fix. Mixed pallets are a deliberate trade-off between warehouse handling at origin and handling at destination, and the right answer depends on the buyer's own dock.
Order frequency is the one buyers most often misjudge. A quarterly release pattern can add 3% to 5% per unit without anyone changing a price list, purely through repeated setup and inspection.
How to Compare Two Quotes Fairly
Normalise before you negotiate. Four adjustments turn two incomparable sheets into one decision.
| Normalise for | How | Why it matters |
|---|---|---|
| Incoterm | Convert both to FOB same port | Removes inland and terminal scope differences |
| Packing | Specify carton grade, ply, and pallet type | Packing is 4-7% of FOB and varies widely |
| Payment terms | Convert to a common cash basis | 60-day terms are not free |
| Inspection scope | Same AQL, same sampling level | One sheet may include zero inspection |
Once those four are fixed, the remaining spread is genuine. It reflects material sourcing, tooling amortisation, and the seller's view of its own risk — all legitimate reasons for a price to differ.
A spread under 4% after normalisation is normally noise. A spread above 8% means one of the two sellers is either misreading the drawing or planning to substitute material, and both are worth a phone call before an order.
What a Good Quote Commits To
A quotation is also a promise about time. We state four dates on every sheet, because a price without a schedule is only half a commitment.
- Quotation validity, normally 30 days for material-indexed parts.
- Sample lead time, from drawing confirmation to dispatched sample.
- Production lead time, from deposit to container-ready.
- Documentation lead time, for certificates that require third-party issue.
Validity matters more than it sounds. Copper, steel, and rubber compounds all move, and a quote held open for six months is a quote that will be renegotiated at the worst possible moment.
Documentation lead time is frequently forgotten. A certificate of origin issued by a chamber of commerce can take a week, and it will hold a container at the terminal if nobody planned for it.
Frequently Asked Questions
Can you quote against a competitor's sheet line by line?
Yes, and it is usually the fastest route to a decision. Send the competing sheet and we will mark which lines are comparable, which are scoped differently, and which are missing entirely.
Why is your packing line higher than some quotes?
Because it includes a specified carton grade, inner protection for machined surfaces, and pallet strapping. Quotes with a lower packing line typically assume a plain carton with no inner protection, which is where compression claims originate.
Do prices change with order quantity?
The unit price falls with quantity mainly through setup amortisation, not labour. Below one pallet per SKU, the setup cost dominates and the per-unit figure rises sharply.
Is a lower price always a substitution risk?
Not always, but a gap above 8% after normalisation usually points to a material or process substitution. Ask for the material certificate and the drawing revision the price was calculated against.
Reference Sources
Incoterms 2020 — International Chamber of Commerce rules for trade terms.
ISO 2768-1:1989 — General tolerances referenced on part drawings.
GB/T 6543-2008 — Corrugated fibreboard boxes for transport packaging.
ISTA 3A — Packaged-product performance testing for parcel delivery systems.
IATF 16949:2016 — Clause 8.5.1 on production control and documented information.