Welcome to the site !!
Sorry for the delayed reply ...
Are you talking about the clamp on the fork guard ??? , if so , you can either build it up with shrink tubing , or wrap electrical tape around it , the other alternative which may look better , is go to one of your local auto parts stores or even a Ace Hardware (any hardware store that carries a lot of nuts/bolts in the slide out bins) , and look in their nut/bolt bin section , they usually have rubber grommets that have a space between each end , which should be long enough to fit between the clamp pinch area just look for one that is similar size to the brake line , if you can't fit/stretch it over the fitting on the end of the brake line , then just cut it lengthwise , splitting it , then place it around the line and put it in the clamp and clamp it down ....
