We have the VIN decoder in the Technical Manual, it is a few simple description lines because there is not much coded in VIN (type, gear box, LHD/RHD, sequential number).
We also have options list in the Technical Manual. I would say that standard equipment was everything that the car had and what is not listed in options. Some options became standard over time or for selected markets, most of it is also marked there.
In the Technical manual we also have information what was on each plate or document that came with the car with all the slots and numbers meaning decoded. Options are on the paint code plate and in the datacard.
You are a Full Member, you have access to all the information. Should you have specific questions - everybody here is happy to help.