Wheel Rim Mount Center Ring

UPDATE!
20.11.2013 - Added customizer .scad file. I modify script found here: http://www.thingiverse.com/thing:40516
20.11.2013 - Added 56.6x67.1 version with some improvements.
25.10.2013 - Made it in Cubify Invent. New version (Ring_71.4-78.1-inv.stl) is more smooth!
23.10.2013 - Made the ring 10mm for better mount & added size sign.

This thing is used for centering Wheel on car when mounting rims other then vehicles DIA.