The file 'Bearing Block For Table (8mm Shaft, 623zz Bearings At 120 Degrees) 3D Printer Model' is (stl) file type, size is 44.9KB.
UPDATE 03/02/2017:
INSTEAD OF THIS DESIGN I WOULD RECOMMEND TO USE THE BETTER ONE:
http://www.thingiverse.com/thing:1445162
ADVANTAGES ARE: the distance between the shaft and the bed is the same as when using original LM8UU bearings. So you will not loose some Z-space and table with trigger the Y-endstop without problems.
At the link below I made the bearing blocks for X-axis. You can see the details there.
http://www.thingiverse.com/thing:1424346
Now here is a similar block for Y-axis (table) of Prusa Sunhokey printer. It will be faster and lighter than stock linear bearing. And it will not damage the shaft like stock linear bearing.
Y_bearing_block.stl | 139.3KB |