How to select objects that are not parallel to any of the dimensions

I have a simple design where I want to select an edge that is at an angle. But no matter what I try I cannot get the edge selected.

This is my part:

```Python
from __future__ import division
from cadquery import *

stand_height = 50
stand_width = 50
stand_thickness = 1
stand_supp_thickness = 1
stand_supp_width = 12.5

stand_lip_chamfer_height = 0.5
stand_lip_chamfer_depth = 2.5 * stand_lip_chamfer_height

stand = cq.Workplane("front")\
.vLine(stand_thickness + stand_supp_thickness - stand_lip_chamfer_height)\
.line(stand_lip_chamfer_depth, stand_lip_chamfer_height)\
.hLine(stand_supp_width - stand_supp_thickness - stand_lip_chamfer_depth)\
.line(stand_supp_thickness, -stand_supp_thickness)\
.hLine(stand_width - 2 * stand_supp_width)\
.line(stand_supp_thickness, stand_supp_thickness)\
.hLine(stand_supp_width - stand_supp_thickness - stand_lip_chamfer_depth)\
.line(stand_lip_chamfer_depth, -stand_lip_chamfer_height)\
.vLine(-stand_thickness - stand_supp_thickness + stand_lip_chamfer_height)\
.close().extrude(-stand_height)

show_object(stand)
```

And I want to add a fillet to the following edge on both sides:


I have tried many things. First selecting faces then the edges. Trying combining selectors etc. But I can't even get the face that is at 45 degrees selected.