Back when I had my CTS, someone posted on the Caddy owner forums a link where you could enter your VIN and get a full list of your RPO options. I [think] I found the same post, but it seems that link is now a paid service.

Do you guys know a source when I can look up all the options and features via VIN?

And/or a site I can look up a vehicles standard and option packages? I used to use ConsumerAutos (ConsumerReports?) but that site seems to have changed too!

People suck at listing all vehicle features on AutoTrader and I would like to know if, for example, a 2011 SLT Sierra with Nav automatically has Bose too, or what diff is in it, or if it is actually Z71, etc.