Hi there, I've just fitted a pair of Zeta pivot levers and am really happy with them they're really good quality about an inch shorter than stock and adjustable for reach.
I'll try to post some pic's when I can work out how to!!
Zeta sells both 3-finger and 4-finger levers but only offers the 4-finger for the AT. The 4-finger size are really 3-finger levers - about an inch shorter than stock.
Zeta sells replacement levers - It looks like you can easily put a 3-finger lever on the AT set as it's really only the pivot-pin / switch part that is unique.