Some pictures of Swifts that I've noticed on this site have a T-bar attached to the stem riser and on it a handlebar bag (eg. Carradice or Topeak, etc.). One of the benefits of the T-bar seems to me that lights on are not hidden by the handlebar. Where can I find such a T-bar? I didn't notice any on the Topeak or Carradice sites. Thank you.