This is the decal set found on the understated Matte Titanium GTS 300 Super models.
Die cuts are correct for placement on all '06-'18 GTS 250 / 300 variants and all '07-'18 GTV 250 / 300 variants.
Although it's difficult to tell from the photos this decal is light grey with the Vespa "Super" lettering in a dark grey, as seen in the image below. The smaller decals are similarly colored, but have only the letter "S" on them.