Oooooh - a new sail pattern - not on the chart.
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If you order new sails from Hobie, you can get any color cloth you want - as long as they have it in stock.
Fortunately, they have yellow, but it's a brighter color than the original.
You can get any sail number you want, but they don't use the same typeface as the originals. I forget what the original font is, but the new sail number font is ITC Souvenir Medium. You could always make your own numbers out of sticky-back.
If you get your sails from somebody else (Whirlwind?) you can probably get exactly what you want, both color and number wise. Just depends on what's available for colors. check out
Sailrite Dacron ClothBottom line - go retro!