First off, it's actually spelled 'duh'.
Second off, after reading this entire thread, I do not know what it is you are looking for, so I will give you the three possible answers that I am aware of.
"I am unable to locate my Service Part Identification sticker that contains all of my RPO codes." If it's not in the glove box, it's probably gone. Not sure what else to tell you.
"I wish to retrieve a list of my RPO codes and their associated meanings by using only my VIN to search, as my sticker is gone, missing, swapped, etc." The only site I am aware of that can do that is
Comprehensive Chevrolet, Saturn, GMC, Hummer, Cadillac, Buick, Oldsmobile, Pontiac, Geo, Dodge, Plymouth, Jeep, Chrysler, Ford, Lincoln, Mercury, Mazda Truck, Mercedes VIN Decoder . This was once a freely open site, however it was brought down and put behind a paywall years ago. I don't know of any other sites that offer this service. Your dealer service/parts department may also be worth wile source to try and use to obtain this list.
"I have located my Service Parts Identification tag for my vehicle, however I am having difficulty deciphering the meaning of the codes, because my codes do not match up, or are missing from, the lists I have found in my searches." My favorite method for this is simply searching 'RPO Codes'. However, my favorite source for cross reference is this PDF list, as it has given me the best luck:
http://www.longroof.info/pdf/rpo.pdf . In the search link that Mike so helpfully provided, there also was
RPO Codes.com- GM option codes,GM rpo codes,General Motors options listed. I haven't really used the latter site, however in my few clicks around the site, it does appear fairly comprehensive, possibly even more extensive than the list I use myself.
If I have failed to address your particular situation, please feel free to clarify.
