How to identify an aircraft part: P/N, S/N and configuration
https://fly-supply.net/en/guides/aircraft-part-identification

Your enquiry checklist
[ ] Manufacturer and model
[ ] Complete P/N, exactly as printed
[ ] S/N when requesting service
[ ] Readable label and overall-unit photographs
[ ] Aircraft make/model and installed role
[ ] Quantity, condition, required documents and date

Use this guide to prepare a request. Exact suitability, installation eligibility, applicable documentation and service scope are confirmed for the specific equipment and application.