avid juicy 3 Which superstar 180mm adaptor plate

I'm not been thick, well maybe I am....

http://superstar.tibolts.co.uk/popup_image.php?pID=359

I want to upgrade my front brake to 180mm, the superstar discs seem quite reasonable but need an adaptor,

Can I heck as liike understand which one to get.

I have Rockshox recon front forks with 160mm juicy 3 on with (i think a IS mounting)

Help please