I made my own extension for about $3-5. I went to home depot and bought 1 foot of plastic covered cable, I think 1/4 inch thick, but I do not remember perfectly. Then looped each end and held it in place with the cable connectors that you hammer shut. Then I threaded the cable through the helmets' D rings and then with the 2 loops locked them to the factory helmet clip. Just a cheap option.