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http://www.thingiverse.com/Mattsedgley/designs

Another LM8UU Holder,

This holder has four M3 cap head screw holes, 5mm dia, 3mm deep

Hole spacing 16mm x 26mm

If you open this file in Solidworks then you'll be able to adjust the height of the LM8UU holder, particularly useful if you need to raise the bed of your i3 etc etc