For clarification.
There are two main sources of information on Cat hydraulic hoses.
The first is the Hose products and tooling guide. This is a .pdf containing information and part numbers for all Cat bulk hose, fittings, adapters, plugs, all the individual components, reusable or otherwise. It can be found on the internet. The media number is PECP5030. The latest edition is 11 and runs to over 900 pages.
The second as Nige mentions is HIS. This is an online resource that details the individual components that make up any particular Cat hose. Dealer only.