How big are our forks?

I see some really nice lights soon to be available from kuryakyn: http://www.kuryakyn.com/products.asp?bn=metric&ci=3988

anyone know if their clamps are big enough for Rocket III fork tubes ?

"Our sturdy, chrome-plated mounts are just the ticket to attach Silver Bullets (or custom lights using 5/16-inch mounting hardware) to fork tubes. 39mm, 41mm, and 49mm sizes are offered to fit many popular models."

Roy

...forks are described as 43mm if that helps. Nice looking lights. Would have been a better choice than the stock Triumph Fog Lamps - oh well.