8mm Self aligning Igus bearing type 2

Based on my previous thing: http://www.thingiverse.com/thing:1824584 just the mount is different. Dim. are 32 by 20, h 12
Note in the picture it is made of ABS and the mounting hole have been drilled to accommodate M3 screws going through.
See here for the same but that can be mounted differently: https://www.thingiverse.com/thing:2108914
Smooth the inside with a spherical sanding tip of about 12mm or something similar, do the same on the Igus sphere outside with sand paper or a smooth file.