Same line up:
QT - 4x4ag.com, discountrovers.com got them. Coming in sets of two - very good design, but pita to install. Front one requires welding. Protecting diffs from both sides and from underneath. Got sliding design on rear to protect rear shaft joint.
MGLee - roverstuff.com (scrover) - sewer cap style
Rockware - sewer cap style + special thingy to protect rear diff joint.
AB, Roversnorth, Each man and his dog - sewer cap style..
Rovertym - weld-on sewer cap style..
Choice is depending on type of wheeling (same as with sliders)...And own look preferences.