Helmet Hook
Keep looking, its there. I personally do not use my helmet hook because I think its a hassel to unlock the seat, thread the helmet cable thru my helmet's D-ring, then get the loop of cable on the hook, then replace and lock the seat. Seems like quite a ritual just to secure your helmet when you park your bike. I generally take my helmet with me when I go places like restaurants or visiting friends. But if I was going to, say, take my bike to go shopping and wanted to avoid lugging my helmet around with me, I would probably just carry a small padlock and use the helmet cable somewhere other than from under the seat. One word of caution; wherever you secure your helmet be mindful that the wind will blow it around if it is dangled by the cable, so if you have nice Arai or Soumy it could get nicked.