Glad you found what you were looking for. I have to ask is this a strap that is to be used with the helmet lock on the left side grab bar? I do not have either on my 15 but do have a hole in the grab bar that looks like it should have a lock installed.
I got it barely used but hard to believe the original owner would remove the lock. Oh well I can live without it. Seldom need to lock a helmet but have a cable combo lock if I do.
I made mine using 1/16" (1/8 will work) wire rope (ACE HW), covered it w/ heat shrink b-4 I crimped it. cost less than $3. I made it long enough to go around chin bar. It loops around my gas cap for storage.
Honestly, I didn't know I was suppose to have one. Guess the previous owner did something w/ it.
I'm thinking not all F6Bs came with a lock.