Go to any crafts store and get black vinyl wrapping. its very thin and adds no extra girth, unless you're into that kind of thing 
Costs a couple bucks for a small roll, self adhesive, and looks stock. I have 3" fork extensions and use it to cover up the line. Don't have any close-ups, but you can see it looks like it came with the bike.

Costs a couple bucks for a small roll, self adhesive, and looks stock. I have 3" fork extensions and use it to cover up the line. Don't have any close-ups, but you can see it looks like it came with the bike.
