The information is available in the Dealer parts system very easily and quickly. Simply enter the VIN and the correct part number shows up.
No time is wasted IF you get a Dealer parts person who knows what they're doing.
Are there links to GM and other manufacturer websites that doesn't require a paid subscriptions and or a log in where I can just enter a vehicle VIN # and it will give me an as built list of all the specific RPO codes without me having to actually search for label or call the local dealer for the information? Even a link to a free PDF chart of the model ,year , The RPO codes and what they mean for given year/model can help at times where the glove box is locked or lots of things in rear of vehicle preventing access to find RPO code label? VW and German car Engine codes/ KW ratings is another PITA .