Filter Cross-Reference Lookup

Look up cross-reference / equivalent / interchange part numbers for heavy-duty filters (oil, air, fuel, hydraulic, cabin, water-separator filters for trucks and heavy equipment). Use when the user gives a filter part number and wants its equivalent, replacement, interchange, or cross reference — e.g. Donaldson P777868 equivalent, what replaces Fleetguard FS19816, Baldwin RS3870 interchange, 滤芯交叉编号查询. Works for OEM and aftermarket numbers (Donaldson, Fleetguard, Baldwin, Mann, WIX, CAT, Komatsu, Volvo, JCB, Cummins and other reference brands in the database).

Look up heavy-duty filter part numbers against the Precise Filters cross-reference database (free, public, no auth or API key). The same data is browsable at the cross-reference lookup page.

How to look up a number

1. Extract the part number(s) from the user's request. You MUST drop the brand word ("Donaldson", "Fleetguard", ...) — the server cannot separate brand from number, so send only the number itself.

2. Separators inside the number are tolerated in both directions: case, spaces, dashes, underscores, dots, and slashes are normalized server-side ("P 777868", "P-777868", "P777868", "32007701" and "320/07701" all resolve to the same record).

3. URL-encode the number in the path. This matters most for slashes — JCB/CASE-style numbers like 320/07701 MUST be encoded as 320%2F07701 or the URL will have an extra path segment and return a routing 404.

4. Call the API once per number:

   bash

   curl -s "https://www.precise-filters.com/api/cross-reference/{NUMBER}"
   

   Examples: curl -s "https://www.precise-filters.com/api/cross-reference/P777868" curl -s "https://www.precise-filters.com/api/cross-reference/320%2F07701"

5. Interpret the JSON response by HTTP status: 200 = match, 404 = no match, 400 = bad input (missing or >64 chars), 500 = transient server error (body { "error": "..." } — retry once after a few seconds, then tell the user the lookup service is temporarily unavailable; do NOT present a 500 as "number not found").

Response — match found (HTTP 200)

json

{
  "query": "P777868",
  "matched": true,
  "brand": "Donaldson",             // reference brand of the queried number*
  "partNumber": "P777868",           // canonical spelling
  "variants": ["P777868"],           // other spellings of the same number
  "equivalents": [
    {
      "partNumber": "15270188",      // the equivalent (replacement) part
      "name": "Truck Air Filter 15270188 for TEREX",
      "category": "Air Filter - Engine",
      "moq": 100,                    // minimum order quantity, pieces
      "deliveryTime": "15",          // days; field absent when unknown
      "specs": [{ "parameter": "Dimensions", "value": "OD: 313mm; ..." }],
      "crossReferences": [{ "brand": "Ag-Chem", "partNumber": "122230" }],
      "applications": ["Truck"],
      "productUrl": "https://www.precise-filters.com/en/products/...",
      "imageUrl": "https://..."      // field absent when no photo
    }
  ],
  "lookupUrl": "https://www.precise-filters.com/en/cross-reference/p777868",
  "inquiryUrl": "https://www.precise-filters.com/en/contact",
  "source": "https://www.precise-filters.com"
}

Notes on the 200 shape:

• specs is capped at 8 entries and crossReferences at 20 — treat both as "key data", never claim they are exhaustive. The full lists live on productUrl / lookupUrl.
• *If the user queries a Precise catalog number (not an OEM number), brand is "Precise" and the match is Precise's own product — do not present "Precise" as the OEM brand being crossed in that case.
• Field values are English where translations exist; part numbers are language-neutral.

Response — no match (HTTP 404)

json

{
  "query": "...",
  "matched": false,
  "message": "No cross reference found ...",
  "searchUrl": "https://www.precise-filters.com/en/cross-reference",
  "contactUrl": "https://www.precise-filters.com/en/contact",
  "source": "https://www.precise-filters.com"
}

How to present the result

• Lead with the direct answer: which part(s) replace the queried number. Name the equivalent's part number, product name, and filter category.
• Show the key specs (dimensions first) so the user can verify fitment.
• List a handful of the other cross-reference numbers (same filter under other brands) — useful when the user's preferred brand differs. Don't dump all of them unless asked.
• Always link productUrl (full specs and photos) and mention lookupUrl as the shareable cross-reference page.
• If the user asked about several numbers, call the API for each and present a compact table: queried number → equivalent → category → product link.
• On a 404, say the number isn't in the public database yet and offer the two links: searchUrl to browse by brand, and contactUrl where a free manual verification can be requested.

Caveats

• Always tell the user to verify dimensions, sealing, and thread against their machine before ordering — visually similar filters can differ in flow direction or mounting.
• Brand names in results identify the replacement reference only; the equivalents are Precise-brand replacement parts, not genuine OEM parts.
• Translate your summary to the user's language, but keep part numbers verbatim.

Links

• Website: www.precise-filters.com
• Browse cross references by brand: cross-reference lookup
• Product catalog: heavy-duty filters
• Free manual verification for unlisted numbers: contact page