I adapted Prusa i3 Aluminium Heated Bed Support (Y carriage Plate) for 3 Bearings for Anet A8. To do this I redesigned the Y-belt attachment (https://www.thingiverse.com/thing:587659) and used the spacer for SCS8UU (https://www.thingiverse.com/thing:1698328). You will also need 3x M3 nuts, 3x M3 bolts and 12x M4 bolts of at least 20 mm long (I used 25 mm).
Note: after this upgrade the bed support will be 10 mm higher and as a result the printing volume height will be 10 mm lower. Make sure you can raise or lower the Z end stop for about 10 mm depending of its position. I have an upgraded Z Endstop and I had to redesign it to make it 10 mm longer, as you can see on one of the images (this file you can find in the list of things).
Y carriage Plate I bought here:
This plate is very strong and now I have no more problems with bending.