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Here is a great place to start http://brochures.slosh.com/ and several of the guys have the RPO list for their trucks. Just ask an members will help. Some that I have seen listed here metrodps is one guy and i think dontoe does to. What year truck is you got?
Some how you can search threads and find em. I just went to internet and fished with "GM RPO codes" and found a bunch but my junk is all wacked to gether.