Customized version of https://www.thingiverse.com/thing:3610780

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=3610780

Using the following options:

screwHoleDiameter = 4
screwHoleCounterboreDiameter = 8
screwHoleCounterboreDepth = 2
side1Holes = 2
side1HoleSpacing = 15
side1HoleOffset = 15
side2Holes = 2
side2HoleSpacing = 15
side2HoleOffset = 12
widthHoles = 2
widthHoleSpacing = 15
holeMargin = 6
thickness = 5
filletRadius = 5
filletCornerAxis = 1
filletCornerAxisRadius = 5
gussetLeft = 1
gussetRight = 1
gussetSize = 18
gussetThickness = 2
circleRes = 40