I'm sorry that it's taken me so long to respond. I have yet to paint the CSS although my intent is to paint it Azzurro Verde Oceano, which was its original color. If you're unfamiliar, it's a very curious pale green, which is pretty cool once you get past the idea of a car painted the color of a 50s era refrigerator.
Before resigning myself to the fact that the car deserved to be painted its original hue, I also wanted to paint it that dark blue color. I looked for a long time for paint codes for that dark blue and could not come up with an exact match. You might see if you can reach out to others on the 1900 registry or on the BB to see what they have to say.
On another note, your name is "sfourza" which is interesting because the earliest North American owner of my car was named "Pasquale Sforza." Sadly, he died a few months before I took ownership of the car.
What color did you paint your CSS? I'm restoring a '61 Giulietta sprint and want to use an Alfa dark blue. There's a gorgeous CSS at Fantasy Junction painted Dark Cobalt Blue that I'd like to use, but I can't find the correct Alfa paint code for it.