Why CRG, of course!
Between the RPO code PDF, CRG site, the many reference books I have (including the "Definitive Z/28 Fact Book"), and my resident 69 Camaro expert sdkar, I figure it will be pretty close.
Unfortunately, I do not have a real one from my car to decode (not that it would match perfectly anyway). It would just be for fun, with no other intent.
While I have your ear, I can't say that I understand what the 2 last digits on the window sticker codes represent. For example... 5D80AA. What does the AA stand for? Not just for the spoiler option, but other optioned line items as well. My guess is color if applicable.