Sigma Tripod Collar

[Helbreath]

Anyone know where to get this newer version tripod collar found here?
I found the current one too shot and too close to lens to ensure a good grip. Btw all the lens listed there use the same tripod collar?

http://www.sigmaphoto.com/html/accessories.htm

 

[HelmetBox]

its still quite new, I don't think its in singapore yet.