don't even try. the factory will want at least 1500 for all four. thats stupid when you can go on craigslist and find them with tires for 500.
sorry for not answering your question im not sure about those codes. i know that the factory ones come chrome plated, polished aluminum, and kind of a flat dull aluminum i think cast.
i am wondering though did you buy your truck new? because the Laramie should have the 20'' wheels. if you bought it used it would probably mean that someone took them off, which sucks!
I got to use my AK........... today was a good day.