Difference between McLaren MP4/13 We$t decals?

I just got some We$t decals for my McLaren MP4/13 by F1 Specialties. The sheet comes with 2 whole sets, with the only difference being the stripe under the We$t word mark is a different color, one set being metallic silver and the other a dark gray. So the question is, which set do I use? I've searched for some pictures online and most seem to have the dark gray underline, but a few pictures I found had the silver instead. :confused:

I remember reading somewhere that the correct decals to use are the metallic silver backed flashes/stripes. Apparently that is the colour used in real life. The dark gray is the way it tends to look in photographs.