JVC Model DLA-HX1E Instructions Manual page 57

Dimensions (unit: mm)
Top
92.5
7
Front
89
298 2
15
267
Bottom
181
M6 (Depth 10 mm)
Attachment screw should be more than 6 mm
but less than 10 mm in length.
Side
36.2 292
Specifications
20
67.5
Center of lens
57