OK, I realize this is somewhat of an old thread, but I thought I would explain LINE-X color matching.
Some dealers offer it, some don't. If you want black or a color, be sure the dealer is LINE-X Xtra certified. Xtra resists fading and maintains its gloss, is more scratch and stain resistant, and contains a Kevlar micro pulp for extreme durability.
I don't have any Hummer pics now, so I'll show some trucks. I will have a LINE-X'd Hummer pic by next Monday.
Here's sort of a closeup of color matched Xtra. The liner is thinner and does not have much texture, both appropriate for this application:
Flares and rockers Xtra color matched:
Xtra in black:
