I bought my MZ3 on 01/02/2004 and it didn't come with 2.3 badges. Today, I saw a MZ3 at the lot where I bought mine with the 2.3 badges on it.
So, I called the parts department. They called Mazda and found out they have 61 badges in warehouse. They ordered me a set. However, I'm thinking of just putting one badge on the right back end across from Mazda 3 badges.