This web site has Custom Options/Specs under "Clubs". Select the catalog, open it to page 22, and all the weights available are there. The stock number ends in the weight in grams, they are listed as +/- in g from "stock".

A full line fitter will have the complete weight kit (not cheap) and you can trial a weight before ordering. Or you can just have a dealer order a single weight from the catalog.

The color code is not listed in the Custom Options booklet, just the +/- from standard for the weights.
You can oder individual weights through any authorized Titleist retailer, however it may still be a little early to order individual weights.

Thanks. I bought a 16.5 fairway but didn't realize stock length was 42.5". Thought it was 43". So I exchanged. Custom ordered a fairway. Wanted 1/2 inch over in length (same shaft) and -2 weight, so as to get SW close to the other club (I realize 1/2" = 3 SW pts, but they don't make a -3 weight). Club feels heavier than I expected. It has green colored weight in head, while other club had black. Just want to ensure green is indeed -2 head weight.

If you haven't already done this...take the weight out and look at the back side, it should have -2 there.

Yes. It said -2. But now another question: inside the weight port area, on the head there is a three digit number. I assume it's possibly head weight or volume, or something? Does anyone know what the number represents? Mine says 165.