question about options codes

[nightmare]

i know that this has probably been asked before, but i can't find it. anyhow, from looking at quite a few glove box options lists, i've noticed that there are some that have 6 characters (1 digit, 3 letters for option code, 2 more characters). sometimes the first digit is a 1, sometimes a 0, sometimes a 4, (you get the point), and the last 2 characters are any combination of A-Z. some might even be numbers. my question is, what do they mean? i know that the second, third, and forth, are the actual code, but what about the rest? are they significant? when redoing the specs list, should i worry about having them on there? here are a few pics of what i'm talking about.