I had some on my 996s I've since sold them before you ask! I got mine a couple of years ago from Cobb and Jagger at Shipley Leeds Yorks. Its now Ducati Leeds. I think I paid about £250-£270 for them. They were good for taking the weight of your wrists, but really needed to be fitted along with a taller screen as they do make you sit up into the wind a little more. I assume you want them for 996?
I have fitted Heli Bars to my 996 last November , I got them supplied by Custom Cruisers UK 65 Main Rd Leabrooks Derbyshire DE55 1LA , Tel :01773 608909 www.custom-cruisers.com
They were delivered quickly to the far north of scotland for the sum of £249.00 inc vat.