Matrox Supersight Installation And Hardware Reference page 87

Chassis 87
Important Use model #6-32 UNC screws (or screws of similar length and specifications) for
mounting the Matrox Supersight unit to other equipment. The recommended
length of the screws is 1/8" (0.32 cm).
[ 2.0 ]
Cover / top chassis dimensions
50
[ 16.8 ]
426.5
REF
[ 19.5 ]
494.4
[ 21.6 ]
547.4
REF