This part is discontinued by Toyota, but is available here.

THE WHEEL CYLINDERS ON THESE BACKING PLATES ARE SPECIFIC TO A FJ55 LAND CRUISER. ALTHOUGH, FJ40 WHEEL CYLINDERS WILL MOUNT THE SAME.
WILL ALSO FIT SHORT WHEEL BASE FJ45 LAND CRUISERS WITH THE SEMI FLOAT REAR AXLE.
COMES WITH THE MOUNTING BOLTS AND NUTS