in a cabinet having vertically extending side members forming part of a chassis of the cabinet , panel mounts , also to extend vertically in the cabinet and to have panels mounted thereupon , are mountable to the side members by integral members which extend parallel to the outer face of the panel mount at a spacing from the outer face and in a direction perpendicular to the longitudinal extent of the panel mount , i . e ., horizontally . the integral members are engaged in respective apertures in the side members or in braces extending between the side members followed by forward or rearward movement to effect securement , retaining means such as pins or studs then being inserted in aligned bores in the panel mounts and side members to prevent return movement .