Customized version of https://www.thingiverse.com/thing:3437746

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=3437746

Using the following options:

$fn = 50
bracket_depth = 7
bracket_innerdiameter = 123
bracket_outerdiameter = 165.1
hole1_radius = 3
hole2_radius = 1.2
num_hole1 = 3
hole2_offset_degree = 45
num_hole2 = 4
hole1_countersinkheight = 3.8
hole1_countersinkradius = 7
speaker_hole1_placement = 78
speaker_hole2_placement = 70