For on Beneteau Specific Parts...
like water pump, O-rings for faucets, blocks, ports, mast parts, helm, etc. what I've done is collect manufacturers catalogs and put them in a binder. Then, when it comes time to maintain, fix, or replace something I have the model part name, model number, and perhaps maintenance instructions readily available. This obviously works better when the boat is new but even after a number of years it's amazing how many parts or items are still available. I had to replace the forward hatch and because I had the catalog I could speak with the manufacturer exactly about what was needed.Every time you go to the chandlery see what catalogs they have available. Ditto boat shows. If you contact the manufacturer about an item ask them for owners manuals, catalogs, parts manuals, etc.On an entire boat there are surprisingly very few items that the builder actually manufactured.This doesn't answer your question, I know, but for those who haven't started their catalog collection yet this is a suggestion.