Electrolux EDW5505EPS Installation Instructions Manual page 23

1.2B Custom panel construction without a template.
1.2.1 Find the center of panel at the top and bottom and draw and line through
both points, dividing the panel in two.
1.2.2 Drill two 1/8" holes per above figure no more than 3/8" deep.
1.2.3 Drill four 5/32" holes per above figure no more than 3/8" deep.