These bearing blocks were designed so you can use an aftermarket (Prusa i3) style bed which is much thicker than the stock flimsy Duplicator i3 bed. These block have the needed 15mm offset spacing required to fit the smaller spaced rods on the Wanhao i3. You will also have to raise your endstop up so the new style carriage will clear.
This is the bed that is currently being used on our personal Wanhao i3.
The 16mm sized file is for the IGUS RJM-01-08 Drylin bearing
The 15mm sized file is for the stock bearings AND the direct replacement IGUS Drylin RJ4JP-01-08
*The 15mmL is for those that want to use the 45mm LM8LUU Bearings
**Make sure to install the 2 M4 nuts under the bearing BEFORE you secure the bearing down with a ziptie..
You will need 16- 4mm Nylon lock nuts for the carriers to be mounted.