Customized version of http://www.thingiverse.com/thing:1102812

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1102812

Using the following options:

Height = 32
BoltHeadDiameter = 8
SlotWidth = 5
ArmThickness = 4
AngledLength = 5
Depth = 50
FilletRadius = 6
ArmWidth = 10
BoltCount = 3
BackThickness = 2
$fn = 50
SlotCount = 12
HoleStyle = 1
BoltDiameter = 4
AngleDegrees = 45