What to define
A specification is a set of references, not only a cable name
A useful wire rope assembly specification tells a supplier what the cable must connect, how its length is measured and which details are confirmed versus still open. Start with the application and the nearest product family, then document the cable body, end fittings and evidence available.
The existing How to Request a Custom Wire Rope Assembly Quote article explains the communication process. This guide answers a different question: what technical specifications should be defined before that request is sent?