German postcode system is 5 numbers - the technology is based on this.
If your time is so valuable you can't spend 30 seconds entering the first couple of letters of a road name then perhaps you should consider paying someone else to drive it for you.
A favourite little phrase of mine "It's Glasses guide not Glasses gospel"
Quite often the book has nothing in common with what you can actually buy/sell one for. CAP and glasses are rarely within a grand of each other and Parkers is just fairy tales
I think when we costed one up there was over £100 just in clips - not to mention the very physical, fiddly and time-consuming job of fitting it all (nightmare!).
I think this is one of those jobs where Audi employ some very clever trained gremlins to install the parts.